I liken this Chong vs Gomes debate to my impressions of Januzaj and Daelhi at youth level.
Both were praised endlessly by people but my lasting impression of Daelhi was that he quite simply did not impose himself enough in games. He would frequently have a good touch here and there but in terms of actual effect on the game he didn't do enough. Januzaj on the other hand was always forceful and constantly made things happen so it wasn't surprising when he made the step up.
Gomes seems like Daelhi like.
Technically good, skillful and always easy on the eye but not enough of an impact on the game. Chong on the other hand picks up the ball and makes things happen. Being physically stronger will also help him in his progression. Another problem for Gomes is likely to be his position. Players like him don't benefit from being stuck out wide but at the same time don't contribute enough to play through the middle or aren't physically strong enough to do it. Januzaj struggled with this after he broke through in the team. He was never the out and out wide winger we tried to shoehorn him into but physically and in terms of numbers he simply wasn't good enough to play centrally.
The sample size is too small to conclude one way or another as they're both clearly very talented payers. But from the little I've seen Chong looks the better bet in terms of going on and breaking into the first team. It would be great if both were to make it