I use both multi strand fused claptons and round wire. I find that the claptons do use more power, but depending on the wires used it could be only by a little. I use claptons wrapped in 40g and it doesn't take very much more power to run them. But if you have claptons wrapped in say 32g, it can take a lot more power to run them.
The flavor I get from fused claptons is slightly better than round wire, but not by much at all (may just come down to what flavor you run). I can run either and and be just as happy either way.
The reason I use Clapton wire more is the durability. I just changed one that I had been using for about 4 months straight on a daily basis, 10-15ml per day. Still had life left in it too, i just felt like installing a new coil. I can dry burn and rewick a Clapton a lot more times than the round wire builds I make. I end up wrapping a new round wire coil once every couple weeks because it gets pulled out of shape much easier when I dry burn and rewick (I use 28g wire, so it's kind of delicate). If it wasn't for that I would use round wire exclusively.
When it comes to ohm readers, it is personal preference. Unless you need one for an unregulated mod or mech mod, your regulated mod will do the trick. With your current set up, that would be your judgment call. They can be nice to have around but it isn't a mandatory piece of kit, for you.