Well, I don't have any personal experience with a rook, but I can tell you about my conch.
First of all, if you have any friends you haven't seen in a while that are especially good at tight, bone crushing hugs, make sure to tell them to be gentle BEFORE they start running towards you. Not a fun pain having someone knock their head into your ear the second day it's pierced. I don't think I've ever had that knees-getting-weak-might-faint-or-throw-up feeling before.
I have a LOT of trouble healing cartilage piercings, but my conch was probably the easiest for me to heal so far. This could be from a number of factors you might want to keep in mind.
1. I had it pierced with a 13g needle and 14g jewelry put in. This put a lot less pressure on the surrounding tissue and in my opinion, sped up the healing process a lot. As long as you don't mind a little extra blood during the piercing process, I definitely recommend doing this.
2. I had it pierced with a barbell (which it sounds like you're going to do anyway). The rest of my cartilage piercings were done with CBR's, and while I like the look, in the future I'll be starting off with straight barbells (or plugs) in all my piercings if at all possible.
3. I cleaned it only with Saline, compared to SSS. While I like the feeling of a nice, hot soak, I don't think I was mixing the right amount of sea salt each time, and this contributed to problems with my other piercings. Isotonic saline is exactly the right mixture to promote healing, and I think it helped a lot.
4. I recently (about 2 months ago) switched the jewelry in mine to a glass plug retainer, and all of a sudden, it hasn't been acting up at all. It never hurts or crusts, it's almost like it's not there at all, except when the light catches it you can see a litte hole. I cannot believe the difference. I've had it pierced for a year and a half now and I think it's finally completely healed.
Alright.. That's my story. I've worn a CBR in it off and on, and the main thing I've noticed is it's sore in the morning, probably from sleeping on it. As for my opinion, I think a conch and rook would look fine together in your right ear. Plus, then you only have to really worry about bonking/ sleeping on one ear compared to both.
Hope I helped some!
Never regret something that once made you smile
