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On one hand, Ash adventures are a bit on the dangerous side so having the Omnitrix would be a boon for him no matter what.
The problem is that Ash is a Pokemon Trainer and for the most part that's what he does. He doesn't fight himself but rather with his Pokemon, Sure there like moments where it would be useful but it's kinda far in between really.
But really other than maybe an improvement of Ash't Training with his Pokemon because of the Omnitrix's Alien giving him a chance to do some new training methods that he couldn't do previously?
He's honestly not gonna benfit as much with this in most cases like Ben did because he's a Trainer. He wants his Pokemon to get the spotlight and not him
Though let's look at this from another angle? If we are talking about how well Ash would do using the Omnitrix, Like how well would he adapt to it?
Again he's a Pokemon Trainer, He's used to dealing with creatures with different abilities and is shown to have some ingenuity as well which is me just understating this fact. He's honestly better than 10 year old Ben just by the experience he already has as a Trainer, No doubt over time he's gonna get much better and better.