my esc just quit on me, im in the market for a replacement.

viper looks good and the price is apealing to me. I see the vxt10 at amain for 155.00 and the vxt1 for 167.00

1. is the vxt10 the older version of the vxt10r?
2. is there a big difference between the two? (10/10r) is the vxt10 outdated will I be sorry i got it?
3. maybe the vxt1 would be best for the price? (i race stock buggy may go mod in future)

any advice would be great, they all seem the same to me