Personally, I'm confused. I only know of metal tubing with 'flares.' Single flare (bad), double flare (common), bubble flare (common). I don't have to deal with that stuff a lot since I don't live in a rust-prone state, but I know of the problems you get...stuff like rear wheel cylinders might as well come with a spare brake line.
But I have had the occasional old line twist while you're loosening the flare nut. Never had a problem using generic lines of approximately correct length from the parts store. Straight tube with the nuts on it and pre-flared ends.
Flaring tools are great, but you generally have to be pretty good at it to get a good result- some guys can do it in their sleep...When I've tried, I ruined lots of ends to only eventually end up with a mildly acceptable flare.
Bending tools are also good...but I've rarely used those, either. Usually, I'll just take the aforementioned pre-flared line and make my bends on piping, metal fence posts...whatever round thing I can use as a mandrel to make the appropriate radius. Just remember to bend in small increments, since 'unbending' will weaken the line, and route the line as close to stock as possible, making sure it won't rub on anything. And don't let it kink, obviously.
It doesn't have to be pretty; just safe.
All that said...what the hell is a 'compression fitting'? edit: or 'pressure fitting.' I thought flares WERE a form of compression fitting.
...googling...okay, I'm wrong on that last part...and the answer is...
NO. BAD. *slap*
Those are for plumbing. As in, low pressure liquids. They are not meant for high pressure hydraulic lines. We're talking 1000psi or more here.