Depends on your hardware.
If you have a particularly fast machine, Splinter Cell will be great (as will Hitman 2, of course). If not, then Splinter Cell will aggrivate you to no end.
I bought, played, and enjoyed both. Hitman 2 has slightly more replay, because you can redo all the missions in any number of approaches (gunfight, stealth, etc...), while Splinter Cell is MUCH MUCH more linear (as in the definition of a linear game).
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