Gamers need proxies for two things: bypassing regional restrictions and lowering ping to the desired server. The rule is simple: the closer the proxy to the game server, the lower the ping.
Stability is critical for gaming. A proxy that drops once a minute means kicked matches. So take a live, verified pool, not cheap lists.
Also: SOCKS5 suits gaming better because it works with any traffic. Games use their own protocols — a plain HTTP proxy will not help.