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wireless usually eats 0-2ms depending on your system, however this isn't really the problem with wireless. What is the problem i wshat you just listed there, packet loss. Who is a more bigger problem generaly for gaming then higher ping as it cause uneaven ping and most games cannot compensate for that.

as for 5Ghz is worse as long as there ain't many routers within your area. That said if there is multiple 5Ghz routers as well it won't help what so ever.

So yeah if there is many tons of non 5Ghz routers in your area, a 5Ghz router will help you as it will cauase much less interference.