I imagine th DMS and Evolve maps are similar from a drivability point of view - and it really all comes down to how much sensitivity you can apply with your right foot. You'll have a lot of torque with a remap, so obvoiusly it's fairly easy to break traction. If it's wet or a broken road surface you have to apply common sense. But when it's nice and dry, wouldn't you rather have all that torque
The Evolve-R switchable maps cable is pretty cool, but you do need a laptop (i.e. it isn't a plug-a-box into your ODBII port jobbie). I don't know about DMS. The gains from mine are very comparable, but I'd suggest there is no point comparing gains measured on different days and different dynos with different operators - just too many variables. Comparing side by side performance is the only real way - or I guess Vbox measured increments would also be good