It means the same exact thing. Goku and Freeza's powers far surpassed what they were able to understand, so they could not tell who was stronger.Darkprince410 wrote: The original dialogue is a bit different.
Viz's translation indicates that it's well above what they're possibly able to fathom or understand, whereas the original doesn't indicate it's beyond what they could ever comprehend, just that it's unbelievable for them to be that strong, which is a noticeable difference.Gohan: “F-father can win…”
Piccolo: “We can’t know that…Their power far surpasses our understanding…”
Nobody could tell that Gohan>Cell until they saw the two fight. That's because just like Goku & Freeza, the powers of Gohan & Cell far surpassed anyone elses comprehension.With Gohan, their reactions were of shock and bewilderment of how strong he was rather than wondering how strong he was.
Tien doesn't indicate that what he felt was greater than before. It's just amazement at how big a Super Saiyan's power is. There isn't anything indicating that he pinpointed Goku's Super Saiyan power from Yardrat and compared it to Sick Goku's power in the Android arc. To Tien, Goku's Super Saiyan ki is just a power that's absurdly larger than his own.As for Tenshinhan's comments, nothing indicates he was unable to comprehend or fathom how powerful Ssj Goku was in either occasion, and the very fact that he's now commenting on how powerful Goku was and how amazing his strength is, when before he made no such comments, suggests that Goku's then current power was more amazing to him than before.
He was lucky to come back home alive since they could've killed him due to far superior strength. I don't see how that refutes Trunks putting up a fight that falls under "fairly well".By his own words, following the encounter you're referring to in the anime special, he was shocked and amazed that he managed to make it home alive, and considered the gap between him and #17 and #18 too huge. Now, obviously, as you said, it's subjective, but the gap being "too huge" and being lucky to have made it back home alive doesn't come across as what one would consider a "close fight" or "fairly well".
-He put up a decent fight, but lost to their overwhelming power.
-He was lucky to come back alive.
As I already said, gaps aren't consistent. Goku vs Nappa is an example.