FTP(Free to Play):
Pros:
1. Allows you to play without payment needed
2. Gives you no time limit and or expiration time
3. Prevents you from falling for a scam if you dont like the game

Cons:
1. Restrictions
2. Not having benefits as members (if any)
3. Item shops MAY change gameplay

BTP(Buy to Play):
Pros:
1. Full features of the game
2. You can come back anytime you want if you feel like taking a long break from the game
3. You have a lot more time for yourself and others

Cons:
1. May have to pay additional money in order to get something special from a item shop
2. Some Pay to Play games have a lot more content