Vape is always worth buying
Vape is still being updated
V4 is more general, perfect if you're just some guy playing Minecraft and wants an advantage, whether or not it's hidden on your screen
while Lite is more for streamers/youtubers/players on servers that screenshare, as it's main goal is being fully undetectable by anyone. For a regular user, I wouldn't recommand it
V4 has more features than Lite
Just check this page for more info on both, almost all modules and just a general description of both clients