Any alcoholic or addict will tell you - you have to have support to make it in recovery. Of course it is possible to stay sober for a short period of time without support, but the majority of us need support from one another in order to remain sober.
Different people prefer different groups.
It really depends on the city for me. Some days you just need to find a meeting, no matter if it is your home group or not. Finding your home group is where some good decision making comes in. When I am looking for a home group, I look for a group I feel comfortable talking with. In order for you to get the most out of a group, you want everyone to know you for who you truly are.