Oh you meant in terms of level not nature/stats. Well they both have the same level since they were part of the same chain. Can you trade later? I'll give you the serious one because the ivs are better.
Sinnoh region I think is the worst region for Ash. Two of his pokemon (Staraptor and Monferno) are rejects from Paul.
Orange Islands I thought was the best just for Lapras and Snorlax.