Must we have a minimum of 4 sos ? Should i up my 4 sos first or troops first ? If yes to the second question , should i max it to lvl 3 or lvl 2 ?
It's really up to you.If you wanne be useful in a war / osw , it's great to have spies . If you were to go for attack build , you could probably hit with success more targets but easily pinned ( spies assasinates you ) . Therefore get some spy towers If you wanne build a SOS , best to build each at Level 3 before building the next one
Max sos' always, especially if trading for guilds. Only SOS lvl 3 has more plunder than a lvl 4 guilds. As for number, totally up to you.