I like the spurs side of the trade, Splitters role is increasing even with a healthy Duncan, and they're going to be resting Duncan more and more after this break. Starting Splitter is averaging near double doubles and hits his FT% above 800 to go with a FG% above 500. He also rarely turns it over... So no negatives and great boards. Parker is having his best fantasy year, and is a different Class than Felton.
KG is going to give you additional counting stats, Ast, Stl, Blk, that splitter isn't going to, but otherwise I like the spur side.
PS. If you need the blocks / steals check for the FA market for Drummunds or A. Johnson, they're both averaging 3+ Stl+Blks on the season.