In my experience, the cleans on both the F-series and the Rectoverb are equally good (I haven;t owned a Stiletto, so I can't help you out there).
For gain, they are both very good, but do very different things. The Rectoverb is super-thick and chunky, smooth, and can fill up a lot of of space in a mix. It's great for 1-guitar bands, because it's so easy to fill a room with sound. My F-100, though (although it can really be dialed to get MANY different sounds and textures), really excells at the opposite - it's great for really razor-sharp, tight, and cutting rhythm tones. Of course, it can get thicker rhythm.lead tones, but IMO then the punchiness suffers.
It sounds REALLY good when you mix the two sounds together. That can't be beat.