Hmm. Good points @nitrodavid and @padawanofthegames. I'll try swapping out the 2 Force Hold I have for 2 Tanglevine and see what happens. I don't tend to use Force Hold on creatures because I run Sleep and Charm.
Also, @padawanofthegames, I run Force Ring + Psi-Orb every game since I cast a lot of Force spells. The decision to run both isn't because of Force Hold. But I see your point nonetheless. Tanglevine doesn't have an expensive upkeep cost.
I know this doesn't factor into the discussion since I am talking about pinning down a mage, but Force Hold works on flying creatures whereas Tanglevine doesn't. If we ever get a flying mage on our hands (hopefully never) Force Hold will be the better bet against them.