Digital Rebel remote control or switch

I'm about to order a remote for my Digital Rebel, but is there a preference between the hard-line version (RS 60 E3)and true remote control version(RC-1)? Also, in practice, with the camera in the "bulb" setting.. do I *hold* the button while the exposure is being made like an old-fashioned film camera..? Just trying to make sure I order the right one.
Thanks!

I would highly recommend this modified from Hutech:

EOS201: Timer remote control (Modified TC-80N3). Cord length is ~130 cm.

This allows you to program a series of exposures with a rest time in between. Very useful if you are doing astrophotography.

Ivan