To answer the title directly, closest to UD Series 1 hockey is....Topps Series One Baseball. Large base set, 1 hit per box (3 I think in jumbo boxes), followed by Series Two and then an Update Set.
It seems some of the more popular sets in baseball are Topps Chrome and Bowman Chrome.
Me personally, I don't really collect modern baseball myself, but I always end up grabbing a box or 2 of Museum Collection and Triple Threads. Higher price, but some decent returns in my experience.