I forgot another bit of my hypothesis! Riding style – if you’re more off the back you’re more likely to prefer shorter reach, more centred/forward then longer reach.
Just been out for 1st ride on my medium TR, feels great, I needn’t have worried about the sizing (5’9″). For some reason I had got it into my head the extra length would make it feel cumbersome – really doesn’t. Climbs well. Thought perhaps I nose dived slightly more than usual on the jumps that try to launch one into orbit but I’m not confident on them anyway.