Twice per week, I like to do rotate through 1 minutes of planks, 10 T2B, 1 minute of a superman hold, and 10 ab roll-outs. I just set a timer and do this for 10 minutes. In reference to danduerksen's post above, I agree that planks can get boring. I had worked up to planking for a couple of minutes simply by holding the position, and I was holding it in position well, not loosely. Then I read somewhere to actively tighten everything from the outside in by tucking your pelvis, digging in your toes toward your elbows, digging in your elbows toward your toes, and clenching your fists. This really ramps us the intensity. When I did that I could only hold my planks for maybe 30 seconds at that point. But I also found it much more effective. So I still do the same little routine above, but I backed my planks down to 30 seconds and began adding 5 seconds every time that I could complete everything. I'm now up to holding them for one minute as I said above.
But I'm sorry, I just realized re-reading your post that I didn't answer your question. I'm assuming for a finisher that you are trying to elevate your heart rate and work on the contraction so I'd probably do T2B's.