It's a matter of taste the only strings I haven't changed were the strings on my Line 6 Variax the strings match that bass perfectly so I just ordered a new set.
Ohio Bassists Club # 230
Mark Hoppus Bass Club #3
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I got a new Lakland DJ4 which come stock with Daddarrio Pro steels. I have never played them before this and now I won't string my Lakland with anything else! Sometimes the manufacturers choose great matches for their instruments!
It depends on what the factory strings sound like.
I bought a Saber 4 string new off of the wall from Chicago Music Exchange in 2007, played it a lot and didn't change the strings for four or five years because they suited me just fine until they started becoming squirrley to tune.