You can get all benefits with either or membership.
If you join a local unit, (almost same cost) you can have an active position in the club, (This simply means that you can vote on issues and policies of the club). There is no penalty for either type membership, simply stated, you get to exercise your opinion and it counts and you can attend or parrticipate at any WBCCI function that exists.
If you are member at large, you can attend or parrticipate at any WBCCI function that exists. You just cannot vote on issues that may arise whether it be a local unit or internationally.
Hit the trust me button and join as a local unit member.
Even if you are not attending local unit rallies, you can go to any other unit rally and you will be welcomed just the same.
check out www.wbcci.org
and you will see all that you need to know about joining. If you have any problems I will be glad to help you.
Where are you located?