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Double Bass Laminate basses with 40" string length

I've been practicing for a classical/jazz trio performance this summer and when I switch between my old and new basses while reading music I can hear that playing on a second scale length is going to be hard. I bet I could get used to it, but I'd rather not. I'm looking for a 40 1/4" string length, give or take a 1/4", laminate bass. I think I need to sell the 42" Czech bass. It's really nice and has a "normal" string length of 42", but I am used to the 40 1/4" scale now without a doubt.
 
I have not played a lot of different basses. I know that this may be obvious to some, but what is the advantage of shorter strings? Is it easier to pizzicato, only? Or is there also an arco advantage? I have noticed that string length always plays a prominent part in "for sale" ads and descriptions, and I have always wondered why.