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idk, was there one of those 3 that you liked better than the other 2? Or maybe play the one that you haven't played in the longest time compared to the others.
If I had to pick, it'd be Emerald. I've replayed it over 100 times now doing various challenges and it never gets old. There is a lot of gameplay and the replay value of that version is nearly unmatched IMO.
Soulsilver. One of my favourites, and sister to the game I am replaying for second time now(the first time was way back in 2010). Walking with your pokemon feels so good, and you can't express your happiness in words when your Golbat evolves, or your Heracross keeps poking at you.
Either SoulSilver or Emerald, the former has tons of fun packed into it with a great story and 16 gyms over two nostalgic regions whilst Emerald is the best Pokemon game imo for many reasons that are too much for this thread xD
In the end I guess it comes down to which game you haven't played in the longest time, I'm currently replaying Platinum :)