I have long used the gold-plated locking banana plugs sold by
Blue Jeans Cables. I use these in conjunction with Belden or Canare speaker cables also sold by Blue Jeans, If you buy both the plugs and the cables from Blue Jeans, Blue Jeans uses its
ultrasonic welding process to connect the cable strands directly to the plugs without solder. No solder is as good as no solder at all, and the connections don't tarnish over time, unlike ordinary bare wire connections.
You could also just buy the Blue Jeans locking bananas separately and use other types of speaker cable with them, but then you will either have to solder your cable to the plug and that will take a high wattage soldering iron since the mass of the plug is high and thus takes a lot of heat to get a good solder connection; or you can clamp the bare wire to the inside tunnel of the banana plug with the included set screw. Bought separately, these Blue Jeans locking bananas are only $9 a pair.
I have never had one of these plugs fail in any way, much less bend.
Caveat: If your binding posts have large holes in them, you can choose to insert the entire prong part of the banana plug into that hole and clamp down hard on the prongs by both expanding the leaves and tightening the binding post nut onto the plug prongs. This process WILL damage the prongs of any locking banana plug by scraping, indenting, and/or bending them, but you will also get a very solid connection that way, more solid than possible through just locking the prong leaves to the inside of the binding post tunnel. I've done it both ways, the intended way and this damaging way. Take your pick.
You could also silly amounts of money on very high quality locking bananas from WBT or Cardas. Note, however, that some of those are meant for use in combination with speakers cables which are already terminated with spade lugs. If you want to use bare wire, make sure you buy the correct version. If you have cables already terminated with spade lugs, you usually will not need to use locking banana plugs.