Black is an awesome character! And so is Zamasu

[GodKaio-Ken]

I just find his overall writing wouldn't be looked at as strongly if he wasnt in a series where villains rarely have a strong development.

This may be the core of the question. This is Dragon Ball, where usually bad guys are evil "just because they are". They may be hitmans who kill under payment, or may wish to conquer world(s) for their personal greed, or may just enjoy killing and destruction. IIRC, this is the first time that they fully show us how and why evil-doers did decide to became what they are (other than briefly explaining it with some flashback, like when they revealed that Kami divided himself, creating a good guy and a bad guy). Authors already spent even more time that I would have expected, showing Gowasu-Zamasu talking about humans and roles of gods... and some parts of Zamasu's story have not been shown yet.
From Dragon Ball, people expects action. You can notice that authors included some fights, even if very short, in almost every episode (in this arc, maybe 55 is the only exception so far)... because audience wants fights from Dragon Ball (IIRC, first part of Dragon Ball GT somehow tried to change this, and it has been disappointing). There are people which rate an episode very low if characters do not blow up half city and destroy at least a couple of mountains.
Also, would you really like see three-four hours of Zamasu and Gowasu talking about the same things over and over again?

I agree with this actually for the most part. I don't want to come off as if I'm not enjoying this arc...its been really great and ranks up there in all the DB Universe to me. I was just trying to say I've enjoyed Black more than Zamasu so far is all even though Zamasu has had more screen time and development.

[Gig]

I was just trying to say I've enjoyed Black more than Zamasu so far is all even though Zamasu has had more screen time and development.

Probably, Black looks cooler than Zamasu due to various factors, including the mystery about him...

[KingKaash]

I love how Black uses this Ki sword as a weapon. It's something new. They've always had fist fights and ki blasts/beams/bombs. Trunks uses a sword but that's always been it until now. Black is a great villain thus far

[Hellspawn28]

I think both are great characters. They are probably the best written villains we had in a long time and Zamasu is probably the coolest thing that we will get to a Makaioshin. Not to mention I see fans that like them for being more deep compare to the villains in the past seeing Zamasu and Goku Black both hate mortals for using their knowledge and skills learn from the gods.