How many plants are you growing?
How big is your area?
With LST you can shape your plant anyway you'd like to, pretty handy if you don't have much room.
Uncle Ben's topping technique is handy when you have a good amount of room to let your plants grow.
Neither will give you more buds. LST tends to give a bunch of equal sized buds if done properly, while Uncle Ben's gives you 4 main colas with some decent sized buds. The overall weight will be very similar, even if you don't train your buds. The real key to maximizing your yield is optimal climate and reflection. Make sure no light goes to waste. Uncle Ben has an article about diffused light, I suggest you check it out.