I believe the answer to this question involves the situation.
Lets say that you have all 4 commandos getting in a fire fight with Fett, i'd have to say Boba wins due to slightly underhanded tactics he has picked up over the years and agile movements while the military minded commandos may hae a squad based plan of attack, its impossible to forsee Fett's next move.
But if you have Sev a couple hundred yards out, Scorch as a distraction with demolitions, Fixer on support duty, and Boxx doing... whatever it is Boss does (strategy maybe). Fett would have his work cut out for him, maybe escape as a best option. Because there isn't a plan i can think of that doesn't involve his head being sniped off or his body blown apart.
And on a side note you can't really compare Boba Fett's intelligence to that of the commandos. He is totally different than them, they didn't have the same training or the same lifestyle. Bounty hunting teaches you alot different tactics than squad based assaults.