Help decide on teams, has my very determined kid outgrown current team?

I need help - I/my son feel loyal to his current team, but the team consists of 4 good players (my son included) 2 mid level players who are improving and committed and then 4 players who just aren’t ever going to play at the level my son is at already, it’s not a training issue - they just lack natural ability and general coordination. No one will be dropped, the manager is great and I agree everyone deserves to be in a team if they love the game.

He’s currently U10s and Watching matches is getting hard, if the other decent forward player gets subbed to give the other kids game time, he’s holding the attack/forward game together on his own. If he was in a team where all the players were at his level they’d be amazing. He deserves to experience that.

He’s got an offer for another team, they’re better and they have more intensive training but it means leaving his friends, his very supportive coach and playing a year up in a team that has 12 players so less game time (but more training). He would no longer be the best player, but not the worst either.

Please someone help me decide, I have no idea what’s right for him and I feel so awful for considering leaving his team in a tough spot so close to the next season.