Pro Tools is NOT the best Daw for recording vocals... It's impossible to say that, c'mon. What about Cubase, Nuendo, Logic, Ableton, or even Garage Band? The fact is, just about any Daw can record vocals extremely well.
If your Mic placement is wrong or your gain structure is wrong, it doesn't make a difference what DAW you're using asst that point.
Mic placement, Mic quality, preamp quality, and gain structure are all far more important than what DAW you're using to record your signal.
Don't get me wrong... If you like pro tools, and it works for you, great. Nonetheless, Cubase, Nuendo, Logic, Ableton, Garage Band etc; all of these DAWs are capable of recording the EXACT same quality signal that pro tools software does.
3Dios, use whatever daw you choose;-) All will come with a bit of a learning curve if they are foreign to you... FL or Garage Band are more than sufficient, but it comes down to what makes your workflow most comfortable to you.
Avid is definitely the best at one thing... Charging you for every little micro transaction they continue to create... Great products, but there is way too much competition on the market these days to call them the best at anything any longer.