Tough one......I'll say telekinesis. Jedi Mind Trick would only work on the weak minded, therefore, not that useful. I mean, look at uses of JMT:
-persuade clerk at counter to let you off without paying
-get out of being pulled over (you don't need to see my identification)
but that only work if your partner is weak-minded. What if you have relations with someone who is intelligent?
-only cool use: if you ran for office, and were very skilled with JMT, you could force-persuade the masses to join you. Now that would be good.
now look at telekinesis:
-pick stuff up
-throw away stuff
-all chores/physical labor becomes easy
-traffic jam? crowded hallway? no problem. That obnoxious SUV annoying you? Woops, it rolled into the breakdown lane.
-choking people, of course
-also useful in bedroom
-get upper hand in physical altercations
-and of course, Force Unleashed scale....force push the Earth out a little farther from the Sun. Global temperature goes down a few degrees. Force blast the crap out of the atmosphere. No more Global Warming or pollution.
and countless more.