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I had a TM M4A1 and have a CA M15A4 rifle. Externally speaking, the CA is miles ahead of the TM IMO, and not just for the metal body. The external details are superior, and it's a much stronger build.
Internally, I'd also say the CA is ahead of the TM. The mechbox is much stronger, it comes with metal bushings, and has a higher velocity out of the box. CA gears are also of much higher quality than stock TM.
I hear people claiming that the compression system in CA can wear out quickly. I put about 20 000 rounds through my rifle, and the only part that showed the slightest amount of wear was my tappet plate which was starting to wear where the nub on the sector gear connects with it. Otherwise, the guide, piston & head, cylinder head, and nozzle were all in what I would consider pristine condition. I replaced all the parts with new Systema parts to increase performance and durability, but IMO, there was no real reason to replace the stock parts. I also reolaced the hopup rubber with Systema, but I don't think that was necessary. I don't see a different with the new rubber.
As for TM, people do seem to have good luck with them. Mine had a snack on its own gears after 10 000 rounds. I replaced the gears and bushings and put in a slightly stronger spring (one the gun should have easily been able to handle) and I cracked my mechbox 200 rounds later.
In light of my experience, I'm avoiding TM completely now. I've even gone so far as to strip all the TM parts off my C8 and replace them with much better CA parts instead.
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