KX 450 or MC 450 maybe 350

So looking to ad a 450 4 stroke maybe a 350. I currently have a 2022 sx 250 2 stroke so going with the Gas Gas would keep things like air filters and and overall knowledge the same which I like.
Helps keep cost down and maintenance streamlined. But I have read a lot of good reviews of the KX450 for slower guys or vet guys like myself. I should also be able to get a KX cheaper. But I keep going back to the Gas Gas because of the same chassis and overall same suspension (yes I know it's valved different from ktm). I have sort of ruled out ktm or husky based on price point. In our district we have A,B,C D. And D is stacked with some good sand baggers. At 38 I can hold my own in the top 10 of a gate of 30 plus riders in 250 or open D. At some point I will be switching over to +30c. But for now I am enjoying racing with these kids, they are helping me get faster after 20+ years away from the sport. For reference I have been enjoying my sx 250, but definitely could benefit from a bike that will get out of corners easier with more bottom end. Of those two 450s and maybe the 350 what do you all think? The plan at this point is to keep the 250 SX, again part of the draw to the GasGas. But again if all goes well, the 250 may end up down the road. If I end up liking the 4 stroke, I'm sure the 2 stroke won't get rode at all.