Cable, here. And Belisle coni's. I use 120's for mink and marten, 280's for otter, and 330's for wolverine and beaver.
Never had cable failure. Ever. Even held black bear, 3 times, with 1/8" cable extensions on footholds that grabbed bears that got into gulo cubbies.

All my conibears get a swivel, I leave chains on and add a length of cable.

I just replaced springs on 12 330s. Most of them got new cable in place of chain.

Both chain(quality) and cable have a place on my BG's. One draw back on cable is it very hard to know when it has weakened inside to breaking point(IME non stainless cable most often breaks down from the inside out). I have switched to stainless on larger BG's that can really get worked by a catch.

First thing I do on any bodygrip, is cut off the chain, regardless of it's size

All my BGs have a swivel at the spring eye and 12-18 inches of #2 machine chain. It last forever unlike cable.

I use both. One thing for sure. I can't stand the factory chain on most of them. Always need to replace it. Dont matter the size. Some I will replace with a heavier chain. And some with cable. I favor the chain more though. Especially on my 330s. I got number 2 chain on them about 2 feet. Than I got another 12 foot with a snap link that I can attach to it and anchor to a tree if I need too. Got alot of swivels in play as well. Got just as many chain attachments as I do 330s.

Fixed it for you

If you can find true stainless steel cable use, I don't have much but got some all made up that Fuller laughaman had .
I'm had them 20 year's now and are like new.

True statement, thanks man

Good info and ....few years back I was at a convention and it was a Sunday ...everyone cleaning up to head home. I was walking past a big snare makers booth and saw a roll of 7 x 19 3/32 cable for cheap....like 20 bucks for 500 ft. I had inquired and bought it for 15....lol
The stuff was like flexible rope cable. I put it on all beaver body grippers 12 ft or more. Recently, I’ve had to replace it due to the cable rusting from inside out. Yes, you can literally twist in half without too much effort.
So multiple swivels and long cables are good just be sure to closely examine your cables yearly.

I can't see that well anymore, coach so i went back to chain. LOL.......... the (other) mike