I would say you should learn matw before amatw, and I'd say it goes the same for tatw and atatw. Once you get them, you might realize you prefer an alternative to the original, but I think you need to learn the originals first. They are easier to learn in the beginning. I actually prefer amatw to matw now.
As for latw, it's completely different to the other moves you mentioned. Other than it obviously being an atw based trick, it's about as different a skillset as it gets for atw based tricks compared to matw to latw. I would say it really just depends on the individual which is easier.