4 is pretty nice, it’s got just the right amount of everything. If you’re gonna play one before, it’s a great choice.
Zero is also neat in how it presents its story and is good if you’re really into the world in which the games take place from 4 onward.
3 (jp) is a neat glimpse into another direction the series could have taken
2 is my favorite of the old games
1 hasn’t aged great but has a fantastic top gun rock redbook audio soundtrack