One important question is what you aim for, do you want to build a fighter or powerful spellcaster or do you aim for an allround adventurer. PFS rewards versatility and there multiclass wins out. Grant a bard or investigator one level of brawler and his allround capabilities grow emensely.
Give a Fighter one level of bard and suddenly he can partake on all these skillchecks and can use a lot of wands and scrolls. Add a level or two rogue to a ranger and suddenly he is good against traps, too. And if you have a dex build you win double.
I for one love variants of 4 levels of bard types + X, besides a lot of good skills and some useful utility spells along the use of spellcompleton items you get up to two hours of heroism (+2Caster level from trait + ext. metamagic rod-lesser)with a single spell. In PFS priceless :)