General

I am also a UA Corsair in Chaos server and I would have to say that the fewer inventory slots is definitely a problem. I can't boss on my own because I'll run out of potions due to fewer slots. Having Shark Wave is nice to ward off KSers but it is not worth making a UA for nor is the medal since there are clearly better ones available.

I just made a UA I/L Mage and I like Gears. It's not that strong but it helps fend off KSers and helps me train on some usually untrainable maps. Plus the third elemental type helps me out with dealing damage to everything. And in general mages just have a fun playstyle.

On the other hand, bossing wise, I will probably suck as an IL too.

I am a UA Sair. I personally dislike the lower hp, and less inventory room. However, I must say that Shark Wave was used for my main attack skill until i got into 4th job. Being a regular corsair has its advantages, but I like to believe that training is much slower without shark wave.

Can you guys tell me more about how much will sair be different after their revamp compared to now? Im looking for pro and cons (actual sair vs revamped sair)
Funding wise, sair probably gonna cost more, but at what point? (compared to i/l)

You are a Marksman, you have %dex and something

Any mage UA is useless if you're not going with F/P.
Make a regular I/L and a UA Corsair.

Sair if you like the post revamp play style
i/l if you like their play style
tbh i hate mages in MS except for Bams