As far as XXX's go I think they go XXX, XXX-BK1, XXX-BK2, XXX-CR. The CR was the last version released (about the same time as the B4 I think) so getting on a bit now but it's a nice steady car to drive but compared to a B4 it does lack some steering. Then again, it doesn't bite you like a B4 can. Depends on your style of driving. The B4 will probably be faster round a lap but an equally set up XXX-CR will be easier to drive over a whole race distance. I've got both and each have their pros and cons. I think my Losi sometimes feels slow because it doesn't have snappy handling but on a tight track I often wish it had more turn-in. It also flies poorly (very bum-heavy) but this may be my set up. The B4 is great on tight tracks but on a fast track I spend more time getting it round the corners than I do concentrating on good lines, braking etc but it flies perfectly most of the time without much effort. I freely admit I am not an expert driver but having had experience of both cars I say it as I see it. In all fairness, I've got an X6 now and although I've only run it twice it does appear to be as good as everyone raves about - steady rear end like the Losi, steers like a B4. Thats muddied the water for you a bit. If you are starting out I'd go for the B4, it may be "common" but that will only help you at first - if you develop and branch out then great but the B4 is an excellent platform to start from.
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