Honestly, I think it was the addition of Billy and Fred that pushed the kids a bit past tolerable for me. Like, it's cool they stopped being bullies and all, but... that's really about it. They didn't really add anything, did they?
At least the original three had bonds with Mini-cons, but Fred and Billy were just two more voices... and an annoying one, in Fred's case, as pointed out above.
As for subs versus dubs? No strong feelings, but it depends on the show, I guess. Case in point: Crunchyroll, for whatever reason, only has the sub of Dragon Ball Super, and I much prefer the English voices, so I'm not watching it on there.
Gurren Lagann, on the other hand... wow, I wish I could watch the dub on account of some of the talent involved, but again, it's not on there (despite the dub VA credits being shown). But I don't really have the same attachment as I do from growing up with DBZ on Toonami and the VHS tapes back in the day, so it's easier for me.
If I had no other choice? I'd watch DB Super subbed, but since I do...