I find grease tubes to be messy. In fact I carry lever grease guns in all my pto powered implements and they all have clear polycarbonate see through barrels on them with bulk load grease fittings and I bulk load them with my air greaser. With clear barrels, it's easy to see when they need refilled.
I don't 'love' any tools as they all have a purpose. I love my wife and my dog and that is it.
I find 150 pound open head grease drums to be way more cost effective than any messy grease tube.