I didn't like either, but I'd take QW over TF2. TF2 maps are just too small overall, coupled with what seems like 70 degree FOV it feels horrible on my widescreen monitor. Plus certain player combos such as heavy+med or pyro+med are just too powerful, engi turrets kill from literally a single shot, spy class could have been an awesome feature, but his slow speed makes one backstab kill almost completely useless. There is also no skill involved as in guns are too inaccurate for a headshot. There is no skill in QW either, as the bullet spread is too big, but at least it's not confined to such small maps. The game is still objective based as in you could win a map in TF2 with all players playing heavy but you couldn't do the same in QW, in QW you really need different classes to complete objective.
I still prefer RtCW:ET over both QW and TF2