Gnomish or Goblin engineering (what is better for rogue)

Can someone tell me which one is better and why is better?

Goblin because of the Global Thermal Sapper Charger. Shares a 1 min CD with the saronite bombs instead of the full 5 minutes and also deals a little bit more damage. Beware of using it at the start without a PW:S so you don't remove yourself outside Prey on the Weak range for a couple of seconds.
Gnomish had its own unique trick but it got fixed some months ago. I'm not aware of anything useful gnomish has to offer atm.

Thanks man.