Airbrushes are like tennis shoes, you need to find the ones that fit you and your needs best. For some, the bulkier bodied brushes like the Paasche VL or the Badger Crescendo fit their hands better than the slim bodied brushes like the Grex or Iwata. For some a gun style trigger works better than a traditional pushbutton model. Look at your needs (ergonomic and painting) then use that criteria to narrow down your search. How and what you are going to paint makes a big difference in deciding which brush to try or buy.
Don't buy junk, you don't get what you pay for with them. You can't get parts or service for the trow away brushes, and their performance can vary drastically from one brush to the next. For the price of the first four or five of the trash brushes you could have gotten a good used brush, and avoided the lost material, lost money, and wasted frustration.
You might look at something like a Tritium. They come in either top mounted gravity feed, or with a side feed. Both versions let you change the needle and nozzle size as well as the size of the fluid reservoir. These are gun style triggers rather than push button models, but they are double action with some amazing capabilities. If you would rather have a push button style brush then you might look at the Eclipse, or, if you want better detail capabilities maybe and XG, an XS or an HP 100-C, or if you want to go even finer maybe an XN or an HP 100-B. These last two have 0.2 mm needle and nozzle setups, though the Tritium can be setup with a 0.2 mm and larger setup too.