Personally, it's just a matter of choice. Newer Tibia clients are entertaining as well, it's fun to level up with all these hotkey systems and all, I know because I played rl Tibia until level 130 (2013 I quit) and it was fun, however, 7.6 can be fun as well, but it is a lot more "slow" and difficult than newer Tibia clients. But newer Tibia versions has a bigger community nowadays and you're possibly assured to build a player base depending on how strong is your game server (advertising basically), meanwhile oldschool servers are played by those who like the Nostalgia feel you can get.