Yes, gravity-fed are more efficient, easier to clean and better for detail. But they don't hold a lot of paint at one time, so you need to ask yourself what application you'll be using this for, and how often you'll likely use it.

Gravity-fed can - and will - spill. They're great for using small amounts of colour that will be changed frequently, like doing fingernails. They're not as efficient for doing large areas.

Siphon-fed (using a bottle) won't spill and that's great if you're working at different angles, as in auto detailing. Plus they can go for longer times with a single colour and thus cover a much larger area before having to refill. You can still use a small open colour cup on most siphon-feds for small amounts of paint, so this is a more versatile tool in this respect.

If this is for hobby application, go with a mid-price range, but if you'll be making money with it, spend all you can afford because a good airbrush will last you a lifetime.

I've had my Paasche VL for over 20 years and they haven't changed the model in all that time - I can still get parts for it!

This maybe depends on what you will be using this for.

Shirts or surfaces- Bottle
*You always get creative one way or another airbrushing on a surface that can be changed quickly.

Models or Autos- Gravity
*you already know what you are doing here and know how much paint u will be using.

What are you shooting for?