250-500cc WR300 Vs TC449

I have a 2010 WR300 with race head, Kehein etc that I use for general woods type riding and so far have been very happy with the bike no probs. Recently I have been riding it on Mx and supercross tracks which it isn't really ideal for.

I have been toying with the idea of a TC449 but a few years ago I had the unfortunate experience of owning a G450X which IMHO was the most hideous creation on 2 wheels! The first thing I am concerned about is are the 449s similar to the G450X? and other than the obvious 2 stroke over 4 what riding differences are there between the WR and TC?

I have the TE449 in the UK and its not like to old G450, the problems have been got rid of.