So, I was just wondering what will happen if I'll let couple different AIs play together without me doing anything. If you want to know which AI is the best for you, check following results

Test I:
Tested AIs:
AdmiralAI (v25)
AIAI (v95) (Crashed during test, becouse of evil newgrf (console report))
AroAI (v127)
BorkAI (v22)
MailAI (v21)
Terron (v209)
Chopper (v10)
Game stats:
Starting year: 4414141 (don't judge me lol)
Ending year: 4414155 (At this point all AIs basicaly stopped doing new stuff)
NewGRFs: a lot of
All AIs at their default settings (except Chopper where I changed Aesthetic to Economic)
Final company prices:
AdmiralAI: €43,925,476
AIAI: €82,951,548
AroAI: €29,047,356
BorkAI: €2 (srsly)
MailAI: €1,853,208
Terron: €19,504
Chopper: €2,524,996
Final infrastructure:
AdmiralAI: 1,567 rail pieces; 5455 road pieces; 211 station tiles; 11 airports
AIAI: 244 rail pieces; 579 road pieces; 29 station tiles; 30 airports
AroAI: 4,536 road pieces; 72 station tiles
BorkAI: 67 road pieces; 22 station tiles; 32 airports
MailAI: 815 road pieces; 34 station tiles
Terron: 99 road pieces; 4 station tiles
Chopper: 27 airports
Final vehicles:
AdmiralAI: 6 trains; 738 RVs; 7 aircraft
AIAI: 1 train; 20 RVs; 96 aircraft
AroAI: 360 (noscope) RVs
BorkAI: 12 RVs
MailAI: 32 RVs
Terron: 1 RV
Chopper: 12 aircraft
Possible winners:
AdmiralAI was the best in building and newgrf compatibility. It was only AI that was able to build and manage trams!
AIAI made best profit, but that's pretty much all what it did (except crashing)
And that's about it. Hopefuly it tells you something about AIs. I don't know what, but soon you will find great use of this post (or not, whatever).
Sum info screenshots:
Test II:
Omg, I never expected that anyone will find this topic "interesting"

Anyway, I did another test, this time with 12 AIs (max) without any NewGRFs to prevent crashing (it didn't help). I also used AIs from previous test that had trouble with NewGRFs to give them another chance. Again, all AI settings default. I think that CPU AI crashed, but I can not tell now becouse after reloading save file, all AIs was working again...
Starting year: 10000
Ending year: 10020 (again, AIs stopped doing new stuff at this point...)
AIs tested: AdmiralAI; AIAI; AroAI; SynTrans; MailAI; Terron; RoadAI; CivilAI; CluelessPlus; Convoy; CPU; DictatorAI; OtviAI; PathZilla
Download save:http://www.filedropper.com/aitest