The only time I would ever use a compression fitting on anything brake related would be for a temporary roadside/trail fix...there's a reason compression fittings are illegal in many states that do vehicle safety inspections. That said, flaring brake lines is neither difficult nor costly, however you can buy preflared hardlines in various lengths and then just bend to fit if you want to avoid it, or have a local hydraulic shop flare lines for you at a few bucks a flare.
FWIW, I've seen enough compression fittings fail in industrial settings that I wouldn't trust one in a brake system.