Not going to argue against Telchine being the best with Idris, but on a practical/realistical point of view there are things to consider other than pure meva.
1) Getting max augments, especially on 5 pieces, can be quite expensive and excruciating, and you might need to farm your own Snoworbs because there won't be enough on AH. Snow stones especially have a wide range of possible results and as such are often the worst type of stones to max out augs.
2) Telchine with capped meva has 5 more meva than Geo+3, but Geo+3 have +12 VIT, 23 more def, more hp/mp, +1 MDB, much higher INT, MND and CHR too
3) GEO+3 are quite nice for Enf set too, lots of macc, especially with set bonus
4) Last but not least, GEO+3 are surely expensive but it's a fixed amount of gil you can clearly calculate. Telchine augs could take less if you're lucky, but they could potentially require much more gil (and time) than GEO+3, according to your luck.
tl;dr
If you can, 5/5 Telchine is the best, but I don't get the "GEO+3 are ***" comments, because they look quite a nice option as well to me.