A very basic answer.
The two V1's normaly called low/high speed V1. The below the low speed V1 you must stop, so the high speed V1 you can just stop......
Normaly the company decides if its a go/stop airline, either it uses hi or low or even mid way. But I think most airlines use a lower V1 and would be a GO company.
Now ducking from all the flack thats coming my way.