Hi mate,

Congrats on the purchase
TKechnically the bikes are the same, same frame, engine, seat, weight, tank, etc. I have personally never ridden an X but the R is very nice and comfortable in town as well as on the motorway. I presume the x is more stable in high speeds if you are in that type of thing.

Here is the comparison chart

http://www.xt660.com/site/node/40

Hope this helps

Enjoy

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that is how i feel about my XTR
Mods so far:
Hyperpro front springs; Hyperpro rear shock spring; modified air box; LED tail light; LED indicators + new relay; YZ pegs; Lucas aluminum bar; brisk spark plug; snorkel removed; DNA stage 1; second hand DynoJet O2 mod; crash bars; front and rear steel braided brake lines; soft EBC brake pads; mitas 07 tyres, 2in1 Metal Mule exhaust, Blocked AIS, tall OEM screen, OTR bash plate