If your doing a "driver" car then it would be better to powder coat your parts. Provided you prep the parts properly. Powder coating needs to be properly prepped just like spray painting. If you screw up your powder coating it's a lot harder to fix.

Powder coating will look great and probably cheaper in the long run compared to spray painting. It will look different but it will look good. However,
you can't powder coat all the parts (can't get everything in the oven).

Spray bombs is the cheapest way to go. Some spray bombs are better than others (quality of paint and spray pattern), but they cannot compete with prof paint gun quality. Good guns even save you $$$ as they use low pressure and don't waste paint like spray bombs do.