Why would a player be better at MTT than STT?

[brad2002tj]

I've been playing poker recreationally for about 2 1/2 years now and became a winning player (I think) at low limits this year. The following stats are lifetime and include all of my learning curve.

STT Stats:

Pokerstars, 100 stt -$100
Full Filt, 400 stt + $300

MTT Stats:

Absolute, 89 MTT + $600

Does it appear from these stats that I'm a better MTT player than STT? If so, why would this be?