Motorola Droid :: SPRecovery Vs Clockworkmod Recovery

I have read through the guides referenced in the sticky but I'm still a bit lost on this sprecovery and clockworkmod recovery or whatever. I've rooted my FRG22 and have the superuser permissions and have installed titanium backup. I will backup my SMS/call log/apps/etc before flashing any ROMs.

I want to now do the nandroid backup business, but I'm lost on whether to use sprecovery or clockworkmod recovery. One of the guides says clockworkmod recovery is easier. I'm not about the 1-click stuff, I'd rather understand what it is i'm doing. Where do I get either of these utilities? Which one is "better" to use?

The concept is that the utility lives on my sdcard and creates a backup image that can then be loaded if manage to flub things up going back and forth between ROMs? Is this the utility that would run when I boot the phone and press X? (Right now if I do that, I just get the phone and exclamation point, i take it because I have no recovery utility installed?) Sorry if this has been covered, I've been reading all evening, just need someone to break it down for me.