I suppose much of it depends on what your priorities are for the cow and calf. I look for docility and ease of calving, try to avoid the muscle/myostatin variants that could be troublesome, so I go through the ai book and narrow down which bulls i will/won't/maybe use, and on which cows, then see what the ai man has on board on the day. I've had easy calving bulls where the calves have needed pulling, and harder calving ones that have almost fallen out. There's nothing guaranteed! I have Elite Ice Cream down as 'don't use' because of the q204x variant, but if you've used him successfully then you'd probably be fine with any of the ai bulls, just need to match them to each cow. I used bb a few times and the calves were fine but didn't tend to sell that well unless they were very well fed before they went.
Bova ai will send straws out to your ai man, so you could always ask him (or her) if you wanted to try something different. They have a lot of top 10 bulls at the moment.