[CQ-Contest] Call sign choice

[cqtestk4xs at aol.com]

Quick question...
I have the call V31XX, but am allowed to use V3X for the CQWW contest.  I tried the call out last night in the Sprint with mixed results.  Although the call is shorter, quite a few guys struggled to get the call right.  Some wanted to make me a VE3, others added stuff to the suffix, etc.
Given a choice which call would you use?  Any comments are welcome.
Bill K4XS/KH7XS.V31XX