Nothing counts until U14. At U14 prep coaches begin to learn who the kids are by either parents reaching out or coaches going to showcases. Showcases are mostly during the spring / summer. By this age it makes no difference what league the kids are in and actually this year the leagues are playing each other quite a bit and no one seems to care. Parents are just grateful there are good quality games between the two.
If the argument is how does a kid get good up to U14, if EHF is better than e9 in this regard. Maybe. Maybe not. I would argue it doesn't matter looking at the rosters of these teams now and where they came from and where they are going.