I'd start by asking why you're reaching for samples (not trying to sound like a pretentious ass, honestly), because that will dictate what type of samples you're going to use, ie if you're totally replacing or just augmenting what's already there.
Generally, my goal with using samples is to augment the existing kit, just using the sample to make up for what the drum may be lacking (body, attack, crack, etc), which is why I've been using more one-shot samples lately. This seems to work really well for metal and heavy rock, especially when they sample isn't being used for the majority of the sound. For kick, I usually lay the samples by hand if the raw kick track has minimal bleed. I have a macro set up in Pro Tools that will tab to transient, drop down to a different track, lay the sample, and then repeat the process a certain amount of times.
For snare, I'll reach for Massey DRT (try the free trial, it's pretty awesome) over Trigger because I've found it to be much more accurate when laying down samples. I'll also lay down a track of clicks to use as a sidechain for a gate, and it also comes in handy if I find the sample isn't working in the context of the mix, that way I can quickly replace what I have using that "trigger" track without going through the entire process all over again.
If I'm totally replacing a kick or snare or working with a project that needs more finesse, then I'll use a multi-hit, multi-layered sample and spend a decent amount of time making sure the velocities are matching the performance properly.
Hope that helps a bit.