It's highly subjective. Fallout 1 is quite enjoyable once you learn the ropes (Internet is your best help there, not the game), but I prefer Fallout 4 in terms of gameplay mechanics, content quality and amount of content. Fallot 4 was much more immersive and overall enjoyable.

If someone has enough time to give it a try: look up on the Internet the controls beforehand and have very balanced SPECIAL, otherwise you won't reach vault 15 (the first mission). Also, there is a gun behind a toilet in that vault, even if you can't see it when looking for it there. Don't bother trying to escape if the mutants capture you.

Those are the acivities I lost too much time figuring out, which can be quite a turn off in the start. I well spent much more time enjoying the game.

P.S. SPECIAL can't be upgraded later