Good info and agree with most of it. I loved my CRFX, one of the best bikes I've ever riden. Problem was it wasn't suited for the tight trails I enjoy so all the power was a waste really.If I were weigh in on this, I would say go with the two stroke. They are lighter and cost a fraction of the 4 stroke to rebuild. I have an 06' CRF 450R. I ride northern Ontario on the OFSC trails. If I were get another bike, it would likely be the CRF___X model. It is a trail version of the R. Much easier to handle on single track.
Two strokes are definitely lighter and cost less to maintain but there's a few draw backs which lead me to buy the WRF. Main one being if I were to look to buy a two stroke trail bike like a KTM 300 it would be out of my current price range, bikes amazing from all I've heard. If I were to try and build a race bike into a woods bike it would get costly again but also I like a bit of weight for plowing over roots and shit, I've read some guys feel race bikes get bounced around too much. Also I love an E-start. Too many times I've dumped my bike down mid hill climb or in many other super shitty spots and without the magic button I'd be fucked. The last ride I had my 450 I had to take a knee twice after crashing, picking it up and fighting to get it to the top, that was when I decided to sell and get a 250.
I hope to ride my WR for 2-3 seasons then sell and grab a newer 2 stroke trail bike with the button.