I had a +55/1045/375 zoo and an other modified to 1000/350/90. Lower was better on two wheels, felt better at gaps, rolling ups, pedal ups. Higher was better on rear, felt better at sidehops, body movements (or how can i say, rear or two wheel movements without unlocking brakes).
Now i ride a +55 stock pitbull, much more fun than my +80 stock koxx.
If i were riding a mod, i'd choose the lower (and longer).