Is 17 really "slightly stronger" than 18? In Dragon Ball Z , 17 referred to himself as the strongest fighter (before he knew the power of 16, Cell, etc). I don't remember where, but I'm positive that it was mentioned he was slightly stronger than 18. Now with the events of Dragon Ball Super and the Goku vs 17 sparring, is this still a valid assertion or has it been retconned?
17 and 18 have all the same abilities and unlimited energy, but I feel like 17 is probably a lot stronger, because apparently 17 continued training and seems to be close to Goku's level, while 18 became a mother and didn't really continue her training. I may be wrong, but as far as I can tell, this seems to be the case.