While I like a group of around 6 to 8, the factors that affects the size of group I like to run are how combat oreinted v.s. in character and the number of active v.s. passivie plays that are in the group.
More the four players that are heavy into rollplaying encounter is a large group but you can easly add two to four players that like being in the background and run side kick type characters. If your group prefers action then politics then a large group works better then a small group because they have and easlier time covering all the bases while having some useful but less essential type like rangers/druids and an extra spell caster or two.
I have a couple of players that are passive. They enjoy the interaction and the game as long as you don't try and bring them to the forefront. Like me they enjoy playing the support characters who buff other, support the rogue in combat, ect.
More the four players that are heavy into rollplaying encounter is a large group but you can easly add two to four players that like being in the background and run side kick type characters. If your group prefers action then politics then a large group works better then a small group because they have and easlier time covering all the bases while having some useful but less essential type like rangers/druids and an extra spell caster or two.
I have a couple of players that are passive. They enjoy the interaction and the game as long as you don't try and bring them to the forefront. Like me they enjoy playing the support characters who buff other, support the rogue in combat, ect.