I'll be honest - I have a bunch of mech mods, but it's mostly about my compulsive need for new, cool-looking setups.

I do use them on occasion, mostly with RDAs, and I like them, but I typically use regulated mods for my normal day-to-day vaping. I like being able to switch between RBAs, RDAs and clearos with different coil ohms, and regulated mods are great for that.
Anyway, I'm trying to cut back on my collecting now, at least when it comes to mods - I have a few of 20 to 30 watt mods, and just got a Sigelei 100 watt, so figure I'm pretty much covered in the mod department.
Also, read in a thread somewhere (if I find it I'll update my post) a really good post explaining why, with all the high wattage regulated mods coming out, sub-ohming is really unnecessary to get good flavor and blow clouds. According to the post, sub-ohming was necessary when mech mods and low resistance coils were the main way to get higher wattages out of batteries. But with high wattage regulated mods you can adjust up the wattage output without having to adjust the coil resistance.
Before everyone jumps all over me, I really don't have a dog in that fight. Some swear by mech mods, some by regulated - frankly that whole discussion bores me. Reminds me of the Sony vs Microsoft video game fanboy crap. Personally, if I was just starting out today, I figure I'd still end up where I am now, with some of both - it's just in my nature to want cool new toys.
Edit: oh, for the OP - if you're looking for a single device and don't plan on collecting others, I'd recommend a high wattage regulated mod. It's just more versatile. Or buy a mech mod, they're fairly cheap if you go the clone route, and see if that's for you.