My preference is 1-piece, and my preference is steel. I’ve had excellent experiences with Leupold QR, Leupold standard, Leupold MK 4, EGW, and Ferrell. That said, Leupold QR rings and bases will absolutely wear out, and the latest batches of Leupold standard bases has had absolutely terrible rear windage screws. I have not actually had any problems with aluminum bases or two piece bases, so when weight is an issue, I don’t hesitate to go that route.
One substantial problem I’ve encountered is Leupold Sako rings. They were very incorrectly engineered and absolutely cause problems at a high rate. You aren’t looking for a Sako base though, so no worries on that front.