In women's gymnastics you can't compete at the Olympics unless you're 16. Biles was 15 in 2012 thus ineligible to compete. From 2013 to now she's been the best gymnast in the world including having the most world championships and most golds of any gymnast ever. Speak to any true gymnastics fan and they'll tell you she's the GOAT and how rare her run of constant success has been.Phelps made the olympics as a 15 year old and you're trying to count that against him. lol
I'm guessing Biles wasn't good enough to make the olympics team at 15?
With out a doubt Phelps>>>>>>Biles
Biles is probably the best female gymnast ever I will give you than, though. Even if she is mentally weak.
The comparison between Phelps and Biles is such an apple and oranges comparison. For one women's gymnastics has only 6 medals in total that could be won in an Olympics. The fact that she won 5 medals out of a possible 6, where 4 of them being gold in Rio is unheard of. Swimming has so many more events and medal opportunity, that hardly a fair or reasonable comparison.