I'd personally recommend the Enhanced Edition. The OG game with mods is more flexible, but you have to manually set everything with a series of mods that use archaic DOS installers, and at the end of the day if you've never played the game and don't have specific preferences or mods in mind, it's better to just get something that is set up out of the box and has a more modern and intuitive interface.
And yeah, it can be a bit intimidating but with a couple guides or quick videos, you should be fine. You become insanely powerful by the end of the game, and there are a lot of cheap strategies involving magic if you're prone to that kind of thing (it's fun!).
Alternatively, pick up Planescape if you tend to enjoy more reading, character interactions, and narrative depths. It has more writing than most novels, and the utter insanity of its world is unparalleled. You can spend hours just wandering around talking to people, learning about the universe and your own forgotten background. Some of the best writing ever.