I already own 2 and i want to play a railroad tycoon game, should i stick with 2 or buy 3 since its cheap now? I am a beginner with these kind of games btw

What are you seeking, particularly?

more curious if there is a diffrence betwean 2 and 3, or that 3 had things that its more fun or better playeble

Well, there is a big difference between 2 & 3. 3 is in fully animated 3D.

As for which is better, that really depends on who you ask. It's a bit divisive.

I'd say yes. Big differences are that we don't have to put little stations out in the country to collect from farms, mines etc - their output is brought into town for us - and that trains can be told to decide for themselves what mixture of cars to have each trip, to match the passengers and cargoes that are waiting. Also, track laying has an undo button so we can keep trying different ways to go round hills. Just watch some YouTube videos to see for yourself.

(You don't have to do what some YouTubers did, which is to make all their trains simple shuttles to the next station. That is one train from A-city to little B-ville, another from B-ville to C-tropolis, and so on. I make that a dumb [EDIT: and boring] way to run a railroad - it works, but they can miss out on some good money that way. I'd have one train on an A-B-C-B circuit and the other A-C direct.)

I also like zooming in to watch the moon rising, or zoom out during a lightning storm at night.