Oddly enough I find the heavier ones feel more stable, if that makes sense.

I know what you mean. Something with a bit of heft to it feels more stable.
The clamp style (crocodile and V notch) could be refurbished , using a triangular file an "milling" the contact surfacesHey guys I've pretty much used 70 % of electrode holders.
Best for me is
Stinger v pros holds rods up to 6 mm tight and you can bend the rod to any angle down side is f u catch the spring on something it will arc out
Next is crock style a decent one like my tweeko holds rods nice but find getting big rods in the grove plus my Paton had a nice crock style. I have the Japanese one on my inverterfusion which is ok but it's old so doesn't bite to well have to bend the rods round the outside edge of the Stinger
Then 3rd is the twist ok but no matter how hard you tighten down the rods never stay in there although this is the cheap ones I have a expensive twist one some where but I never really got on with them . I used the myking a few times ok for small rods but finding the hole is a pain some times
My preference is my preference and my opinion it is down to the welder I'd recommend trying out as many as possible so you get a feel burn a box with each in the most common sizes and you will find which you will prefer
Hey guys I've pretty much used 70 % of electrode holders.
Best for me is
Stinger v pros holds rods up to 6 mm tight and you can bend the rod to any angle down side is f u catch the spring on something it will arc out
....if it doesn't work out I'll take a look at Bernard cheers.