Is Gilgamesh in limited banners? Any banners worth summoning rn or is the pool the same for all?

Gilgamesh isn't in the normal summon pool, he's limited to his rate-ups. FYI you can see what servants are available to summon by clicking on 'summon info' on the summoning banner.

Gil is NOT in the normal banner, no limited servants are. Gil does get a rare up fairly soon however! Sometime within the next 6 weeks I believe

I believe the little Gil is in the pool now~

You can see the list of "Limited Servants" on summon info. As for Gil, he already got couple rate ups back then, and will have another one on Fate Zero event some times after the upcoming Da Vinci event (either this week or next week)