I can honestly say that I've had many, many hours of hood time with both flux core and solid wire. Both have great characteristics, but both also have drawbacks.
Flux Core:
This is more expensive stuff, but as long as you switch your leads(the ground is +), you can achieve a fantastic looking and structurely sound weld. I love using it outside, on thicker material, and when the material isn't the cleanest. The drawback is, on thinner stuff, it's much harder to use without putting burnholes into your piece. It is much smokier and spatter is pretty common, not a good idea to use indoors with closed doors. This takes skill to use. If you are a master at stick welding, this is the same exact thing. It's also very portable if you have a portable welder. Since it's only the power source you need and not a gas bottle, it's very versitle out in the field.
Solid Wire:
This stuff is very clean, very easy to use. It's easy to manipulate and weld, you can get different puddle flows and penetration by using different mixes of gas. The drawback is it does not like dirty steel, if it's windy or theres a lot of air movement, your gas is blown away, you have to have a gas hook up, which costs extra money and limits your portability. But for thin stuff, it's the cat's meow. I can weld exhaust tubing without blowing through and have it look fantastic.
I owned a Hobart 140 for 6 years before upgrading to a Miller. That Hobart NEVER gave me any problems or hiccups or any issues whatsoever. I welded the Ranger with that machine!

I recommend that machine to anyone who wants to start out welding. I don't trust HF welders, simply because going cheap in the welding industry....there's a reason why it's cheap. NEVER go cheap on wire, materials, anything. Get the good stuff with quality control infused into the products.
Wow...this was long.....but I take my welding kinda seriously too.
