Letro is the strongest A.I. and should only be used with signs of gyno IMO, it'll really dry you out and kill your sex drive and is overkill for water retention but should always be kept on hand
Aromasin is the ideal A.I. IMO because it's the only A.I. to my knowledge known to also raise test and IGF levels...this is what I'm currently using now 12.5mg eod is ideal but if you wanna split hairs you can go with 1/4 tab ed.