I understand that the head should be half of the cab.. so a 8 ohm head, run a 16 ohm Cab.. etc..

My question is, is it better to run 16ohm to 16ohm if i have the option to? Or should I run 8 to 16? I always run 16-16 and never had an issue, but if i run a full stack, ill do 8 to 16/// 8 to 16