I actually call it "eye test". Basically, I use the servants myself, testing it with various CQs, Advanced Quest, and boss fights (usually Beast III/R fight), and judged them by how their perform. I Grail servants who I saw has huge potential to be great, like Cu, Cu Caster, Robin Hood, Okada Izou, etc.

Even with that, I also have my own preference. I prefer grailing low rarity servants (1*—3*), usually male gender, because everyone seems to be grailing 5* and female servants. I like to do something a Little bit different and also proving to everyone that you don't need 5* and meta servants to clear high difficulty quests.

What has the most priority for me was the 2nd option, because for example if there is a Servant who looks like Sakura Matou or a favorite character that I admire a lot.

As in my case, I had leveled Kama and Kama Summer for level 100, through Paliginensis, because for me it reminds me of Sakura Matou, but different.

In the case of BB, it also reminds me of Sakura Matou, but it's the same with a small difference, in the summer I'll start leveling BB Summer to level 100.

@DeltaBladeX Yeah, all I know is that in 2 years the Grand Graph System will come out, to create Counter Force.

Favorite servants. aka Morgan, barghest, and Draco. I have more but I have barely enough qp for Morgan only till lvl 104

Well... I mean... I have Koyan Dark np4 + 112 level... So yeah... Definetely not a meta but a favorited one ! 😋 also when i got np3 Tiamom i consider her to level 100 in an instant.