Episode 5 wasn't the worst. Episode 24 was, and it was
terrible. Episode 5's second half is actually passable. Z's worsts come from those Uchiyama episodes in the middle of Cell arc. Everything looked absolutely terrible for quite a significant stretch.
I take issue with your picks for "Super's best". Episode 13 was on-model, but aside from that Takahashi cut at the end, it was robotic and not even inbetweened. Not entirely sure why you've used so many gifs from that episode.
Super's best:
Episode 14 - Ryo Onishi - Goku vs Beerus
Episode 26 - Naoki Tate - Goku vs Golden Freeza
Episode 2 - Yuki Hayashi - Alien vs Dinosaur
Episode 13 - Yuya Takahashi - Goku vs Beerus
Episode 47 - Naoki Tate - Trunks Sword Deflection
Episode 48 - Futoshi Higashida - Trunks vs Black
Super's had some pretty cool highs. They're few and far between, but they're pretty nice.
Here's the thing with Dragon Ball Z - it was never a particularly well-animated show, even for its time. The repeating frames that we've come to call "Dragon Ball Fighting™" are actually just really standard conservative animation used in shows since forever. It's nothing special. Z wasn't all about that, it actually had plenty of really cool moments that featured cool character movement, interesting camera work, and hugely detailed character art -- the latter of which was the series' strongest point by a landslide.
Episode 31 - Kazuya Hisada - Kaioken Goku vs Vegeta
Episode 64 - Masaki Satou - Vegeta vs Reacoom
Episode 232 - Tadayoshi Yamamuro - SSJ2 Goku vs Majin Vegeta
Episode 166 - Kazuya Hisada - SSJ Goku vs SSJ Gohan
Episode 103 - Masahiro Shimanuki - SSJ Goku vs Freeza
Lots of interesting stuff in there that doesn't just become nothing but conservative action. Whether you think that's as interesting as Super's highs is up to you. Z really shone in the movies, but that wouldn't be a particularly fair comparison.
Uchiyama and Ebisawa are supervisors that get rightly criticised for their awful style, but the animators underneath them were very good. Uchiyama had
Tai'cihiro Ohara, and Ebisawa had
Toshiyuki Kanno. Despite heavy corrections, their episodes still had plenty of good work within them. Kanno eventually started taking a lead role once it was clear he was significantly better than Ebisawa.
Even during downtime, Z's pristine character art by a large majority of supervisors carried episodes to higher standards than they really deserved. It's same way that Jojo's Bizarre Adventure Part 4 isn't a show that has much movement or proper animation, but its pristine character art and solid direction carries it quite high. While you can't always rely on that in a martial arts show like Dragon Ball, otherwise you might as well read a manga, it does certainly help create some striking imagery if used properly.
Super's major issue right now is its schedule and lack of talented key animators. It means that the talents that do pop up often don't have time to do anything worthwhile, or are forced to rush out work that looks unrefined. It means that episodes are always making compromises -- do we focus all our attention on the action and let the dialogue scenes suffer (#50), or do we try and balance it out and end up with a reasonably consistent episode (#48)? Sometimes nothing works and you end up with episodes like 24 where absolutely nothing works at all. Toei's current way of rectifying the situation is to have multiple supervisors and assistants in an attempt to apply polish to the entire episode. It's a horrible situation to be in and I feel really bad for everyone involved.
If Super's production environment was even remotely healthy then it would absolutely, without a shadow of a doubt, be significantly better animated than the previous series. It might not feature the best aesthetics thanks to Yamamuro's character designs, the horrendous colour design, and total lack of atmosphere, but it'd at least showcase the refined talents that are working on this show. You only have to take a few looks over at quality and frequency of One Piece's best moments to see how feasible that is. Super has only just reached a point where it can deliver conservative fights that don't look absolutely tragic.
Unfortunately, as it stands, Dragon Ball Z is still the better show. Great character designs, talents with time to draw them well, and some pretty interesting fights on the regular. Super is only 50 episodes in, and is only just starting to find its feet. It's slowly working out how best to deal with its situation. It's hard to say how it'll evolve over the next year, but I hope it'll keep improving and eventually give us the visuals it really needs. Optimistic, but I suppose we'll see. Don't think it'll change my other issues with the show, but that's a topic for another time.