Guard Carts.

If you were chosen to pick only one guard cart for a support bot, which one is the best choice?
Sword Guard - Blast Guard - Beam Guard - Shell Guard (useless?)

Personally, I think the Blast Guard cart gives the most benefits, since all types often use them (zooks; by observation).
What do you think? Hmm. Discuss each cart's advantages~

Blast guard for most benefit.
Since my fencer will benefit from supports lacking sword guard nishishi.

Blast guard would probably be the most beneficial but depending on the bot sword guard could work just as well.

For support bots, blast and sword guards are top priority; the only beams you'll have to worry about in a healing group are stardust, jupitizer, and ABRs shot from ground level. Explosions and melee can both hit crowds, so you definitely want to shield against at least one of them. Personally though, I'd prioritize sword guard on supports for two reasons.

When you're healing, you'll probably be in your own backlines, whereas most arts will be in their backlines. Direct confrontation with enemy artillery should be rare.

The more popular blast weapons - bazookas, breakers, railguns - are predominantly shell damage in most cases. Titan bazookas and all types of breakers are 80% shell damage, mini bazookas are 65% shell damage, just to give a few examples.