One Canspray or One Paint bottle(for airbrushing)?
For flat coat usually won't consume that much, so maybe can (both canspray or 10ml).
Again depend how thick you need your topcoat to be.
To be safe, get 2.

For top GLOSS COAT, confirm not enough as you need a thicker build up for gloss.
Canspray also got more wastage if compare airbrushing.
BRAND diff
PRICE diff
AVAILABILITY diff

anyme, what difference you want to know?

Can I ask you, whats the diff for tamiya acrylic paint and other acrylic paint??

Be specific with what you want to ask, if can compare with something you intended to use against tamiya epoxy putty.
Even there's few diff tamiya epoxy putty > http://www.hlj.com/hljlist2/?Word=tamiya%2...%20putty&Dis=-2.
Which one are you refering to?