cba saying for every race, might later, but as fs I do a bit different:
Specific(Fellowship)
1:All
2:Gandalf
3:Ara
4:Frodo
5:Boro
6:Gimli
7
ippin
8:Lego
9:sam
0: goes to beacon if share
gandalf as second, as you often need to micro him close for his aoe, which is probably the spell I use most as fs, as gand got that much mana so he can mass use it, unlike ara with his wave etc.
Ara as second, yes you have him at first pos in the group with all heroes, but he, gandalf & frodo is probably the most aimed heroes in fs (even tho they're the ones that's hardest to get), so you can micro him quickly if needed + you can micro his wave better.
Frodo is a must in 2-5 as you need to be able to pick him fast with your left hand, because his stun is very much needed for fs, kinda what makes them win a fight vs naz in 1v1/9v9, and it's very good to help saving heroes.
boro as 5 because of taunt(horn), can also save a lot of heroes if you're quick to use it.
gimli as 6 cus you often need to stun very fast, and clicking on 6 is faster then mass tab, and since gimli got the longest ranged stun/shortest cd, he shud be the one who you use first, then sam afterwards, so rather be fast to get gimli + you can also micro his slam.
pippin as 7 cus of aoe buff & drunk, just as with boro horn & frodo stun, it can help save a lot of heroes cus of the drunk slow + making a naz - fs fight a lot easier for fs.
Lego as 8 - you can micro his wave, also you can flee with him fast/move him to the right places, as he is often placed a bit away from rest of your heroes due to ranged attack - also easier to lame/lure with him if you can micro him.
Sam as 9 - well, since we got gimli as 6, it's not really needed, but you got the free slot, so why not use it?
beacon as 0 = cus it's easy to remember, and a quick beacon often do the outcome.