I own both games and both are awesome imo.

Farcry does get annoying with limited fast travel and cleaning out an enemy post just to come back sometimes 1-2 mins later and find its fully populated again.

And Fallout 3 does get a bit boring with constant VATS use but i find you can mix it up and keep it interesting. Using the Nuka-Cola grenade is awesome. Nothing like cleaning out a room with a massive flame ball :P