Loading apps: "device" vs. storage card

[rbade]

I recently bough a Tilt with a 2G SD card and have been trying to get educated on WM as well as this phone. I did the remove the bloatware thing and have been tweaking a bit and loading a few apps. My question is: what is the best practice (esp. for a novice) in choosing the "device" vs. "storage card" option when I install a .cab? I'm refering primarily to performance. Thanks.

-Bob