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I use the Rotozip. It comes with 1/8 or 1/4 in collet so you can use dremel bits/tips, router bits, or drill bits. With the flex shaft, there's nothing it can't do that the Dremel can. You can get an angle grinder attachment, a circle cutter, etc.... You can cut 3/4 pine in one pass, I don't think a Dremel will do that. However, if you're cutting pine boards to work on your car you've got other issues to deal with :)
Take a Q-Tip and cut it in half. Stick it in the collet of the dremel and use it to clean nooks and crannies. I used it on my power window switches and those 30 year old switches look better than the reproductions.