That depends on your preferences. If you prefer Joint Posts, then the YSS Asamoya or 17th are likely good choices, as both do a lot of such, the YSS Asamoya entirely running through such. The 17th is almost certainly looking for more canon fodder...uhm, infantry, yes.
If you prefer SP, then the YSS Asuka or YSS Miharu are a better choice. Both favor such and have powered armor pilots among their ranks, and some need for such. I'm not sure which is more in need for more cannon fodder though. The YSS Asuka's crew is currently serving on the YSS Akigumo, though we're on leave on Yamatai temporarilly.
I of course, am biased, playing a member of the YSS Asuka. If you should join us there, I play Santo Hei Inoue Tio, an inexperienced Neko Mindy pilot. (She's too short for a Daisy anyhow.)