Personal opinion but I like the looks and features of the '04 Rene over the '05. IMO it looks more "Jeep-like" especially when lifted and more aggressive tires are put on.
Plus the '04 has fewer miles and has fewer electronic gizmos to go wrong down the road - ABS, traction control, etc.
Important question though: What colors are the two you're considering?
2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16