Based on your input, my vote would be for a
WSM or similar vertical smoker for the most versatile reliable and stable temps. You could even add a temp controller such as a BBQ Guru to it that makes it even more carefree.
To me personally, I absolutely LOVE the flavor that charcoal gives- even over straight wood smokes. You know that sweet smell you catch in the air when you are at a park or perhaps a neighbor that is using charcoal versus a wood fire smoke? I just cant seem to replicate that in my electric MES with any flavor of pellets or chips. But I like to use my MES for other things such as cold smoking or jerky, salmon, and smoked sausage that it is best suited more for. But grilling is another matter. In that case a Kettle brings in that aspect.