10 Mil DL Event Choices

Literally any 4* who is not limited (Summer ones, for example) or welfare, and this is including the story locked ones, as Gorgon, Emiya Alter or Gawain.

List is there: http://fategrandorder.wikia.com/wiki/10M_Downloads_Campaign#SR%20Servant

Caster Gilgamesh (one of the best arts support) Lancuria Alter (buster crit, with an AOE NP and best mana burst of the game, likely the best 4* lancer), Saberlot (arts crit beast with a ST Arts NP) and Heracles (supposing you did not picked him in the first 4* distribution, why? he was the best of those ones) are my personal recomendations. That's supposing you don't roll for them untill the time (likely september, many rolls will flow untill them...).

Im getting either Lobo or CasGil. Im not interested in others, but time will say.

you should get either what you need gameplaywise, or a character you really like.
personally i need a aoe lancer, so probably lancer Artoria.

Probably either Gorgon, Tristan or caster Gil, just cos I like them.

Your question have been answered by people.
for me i gonna pick Gorgon( SS rank in thiccness lol ) and Caster Gilgamesh for my main if i don't get him on Babylonia gacha or Saberlot ( i already have heavy Art team, so he can unleash his full power ).

Fionn, Stheno or Astolfo not a bad choice............they're good for memes, especially if Grailed to 100. I laugh so hard while writing this XD.
Just kidding, don't take it seriously :)

Either madea lily or lancer alter

Here is just some personal suggestion.

AOE, ST DPS, support, special.

AOE farming type: well, SSR AOE (better attacking status) and welfare SR AOE (NP5) could be better choice, therefore I am not really recommend for pick-up SR AOE
Except Lalter/Emiya since they are kind of great for Critical Buster in fact. And except Nito since she is kind of specific farming,
And except SR Berserkers (Fran/Lancelot) because SSR AOE berserkers are not frequently seen.

ST DPS type: It is good to pick another servant to accumulate higher-level NP. Like I prefer NP2-3 Saberlot. But not new servant, since in comparison, even though you are a FTP you may still posses some SSR which could better than SR as ST DPS. Only few like Saberlot/Penthesilea could be same level as SSR or even better.

Supports: It is good to pick SR supports, because normally even 4 BIGs (Merlin/Waver/Tamamo/Skadi) and Nightingale still have some blank areas. In other words, SR supports have unique special skills/NP make them always shinning. Like Caster Gil and Medea Lily

Special:
Tristan. S+ ranking as for tough quest.
Medusa Lily/Stheno as Sisters.
Gorgon/Lobo: Well, pick one if you have enough materials, since Avengers are rare to have.
Yan Qing, Quick.
Herc, but normally you already have, right?