For reliability and low cost operating/maintenance, I'd go with a GOSM gasser. As far as tending your rig, I wouldn't leave any type of smoker alone for more than 30 minutes unless everything was cruizin' along nicely...even then it's not a good idea.
That said, if you will tend your smoker to be safe and sure that dinner won't be ruined, you may as well use the heat source that you like the best. I'm referring to flavor and quality of product...wood burners being the best, then charcoal, I've choosen to go back to charcoal as it provides so much better flavor than a gasser. I've been a gasser for over 20 years out of convenience...I'm coming back for the flavor. Gas/electric heat adds nothing to flavor...charcoal or wood leave you a definate impression and nicer depth of textures and flavors. The smoke penetration is much better as well.
This is not meant to change your mind, just give you a few things to consider so that you make an informed decision.
Good luck with which ever you decide to go to.
Eric