I don't think there is a best. I had a clifford and some no name and both worked great. As for drilling and tapping, it is just going to happen, so grin and bear it
ideally prep work is key, I clean it all down with brake kleen, I RVT'd my gasket to the cover, let it dry for a day after I measured and tapped the needed holes, and then RVT'd the gasket and set it, torqued it down and it hasn't leaked yet, knock on wood.
85' CJ7 Laredo, 383 GM, Turbo 350, NP 203. SOA, 2" frame lift, 34" TSL swampers, Dana 30 open, AMC 20 w/ detroit locker, 4:10's, 1 Piece Mosers, 35" boggers to abuse when needed.