Gosh, that's a hard question!
I started off with the Palm Mini paddle. I'd been using the Palm mini for a few years, mainly in the winter, and the cable fractured internally. I rang my dealer and he put me a new replacement cable in the post, free of charge. The original cable was quite thick and in low temperatures it tended to go quite stiff. I'd mentioned the problem on the SOTA reflector. A little while later, an envelope turned up at my house, the envelope contained a very courteous letter and a new design of cable direct from Palm - that's what I call customer service! The new cable is much thinner and more flexible, it's been trouble free. I later upgraded my Mini to the ABS body - it's just a matter of swapping the body over, so that's an option if you later decide that you want one style over the other.
I've only ever used twin paddles so I can't comment on singles. I don't use Iambic keying except for 'CQ' my brain just isn't capable enough!!
My favourite SOTA key is my Palm Pico paddle, I keep it in an Altoids tin which also doubles up as a base. I also upgraded the Pico to the ABS body, but it's not just as simple as the Mini, there is sometimes a bit of 'fettling' required, but it can be done. I'm very proud of my shiny finger pieces - they show that the key has had lots of use!
Bottom line - Palm keys are very well made and reliable, choose the one that fits you best and it will serve you well!