You are clueless!
The 350 is a little flimsey toy compared to WR.
I OWN BOTH
I'm so tired of this un-informed talk about KTM's being something special.
They are light, they look trick, and are styled extremely well.
But they are NOT heavy duty, robust, or high-performance!
This is a WR FORUM.
So you're the expert on all things KTM, but we're uninformed? Yeah right.
You know what? I own a WR and KTM too! And I've ridden a 350 XC-F and it flat out hauls the mail. "Flimsy" is hardly a word I'd use to describe it.
If you want a big heavy tank that is 'ride it hard, put it away wet' reliable with minimal maintenance, a WR is a great choice. So is the CRF450X, but you already knew that.
But not high performance? Give your head a shake Spec for spec, KTM offroad bikes smoke WRs and CRF-Xs and that's a fact. My 250 XCF-W is a WAY higher performance machine than a WR250 (yes I've ridden several) or my former CRF250X. Night and day difference, my KTM smokes them hands down. Lighter, faster, more power, better ergos, better suspension, etc. Will it require more maintenance? Yeah, so what? Worth every penny, IMO.
Again look no further than GNCC/WORCS, EnduroX, hard enduros, you name it. Gobs of KTMs in all sizes and 2/4 strokes. Next to zero WRs or CRF-Xs. If there are blue and red bikes, they're MXers woods out.
Some choose reliability over outright performance, some choose performance over everything else. There is no right or wrong here, just different needs, and plenty of different bikes to choose from to fill those needs.