It also depends on where you are racing and what applications. If your track follows ROAR rules then you probably wouldnt want to buy the quad magnet or the new Checkpoint...neither are ROAR legal.
If you are just racing in unorganized racing with no rules then I think any of the 19T motors will be fine for you.
We personally feel "if you follow the ROAR guidelines" our new Komodo is the best 19T out there.
Good Luck
Ernie