Very little in practical terms - the welded can be a little stronger in some situtions. Used to be more of a concern if you ran V brakes as the join could be better with a weld.
On a well built wheel absolutely no difference at all. Only difference is if you really prang a pinned rim it can be a weak point but you really have to smash it hard so hard you are unlikely to walk away from the spill.
Fig rolls: proof that god loves cyclists and that she wants us to do another lap
kinda strange that a manufacturer would make both kinds on the same hoop, (sun ringle MTX 31''s, unless i guess these are old stock. was looking on CRC
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Paul
After-market or OE.
Parktools :?:SheldonBrown