honestly, there’s not a lot of difference between bearings. People will argue otherwise, and say x bearing makes something phenomenally better than y bearing, but I’ve never noticed a difference. As long as the bearing spins freely, and doesn’t make a yoyo responsive, it should be just fine. If you feel the need to spend $25 + shipping on a ceramic terrapin bearing, go ahead. You might try it and think it’s way better. But honestly at the end of the day, your throw is way more important than a bearing for spin time. Some bearings can help with centering the string so it doesn’t rub the walls, but again, that doesn’t affect play nearly as much as some people may lead you to believe.
As for your other question, I believe the capless comes with a flat 8 or 10 ball steel c sized bearing. My guess would be 8.
Oh, and both ceramic and additional ball bearings are supposed to increase spin time.
When I started out, I bought a ceramic kk because I thought it would be the bees knees, and make me way better. It really didn’t do anything that the stock bearing in my G5 couldn’t do.