All depends of the style your are playing and the sound you wish to achieve. You have to consider that these two cabs are not for everyone.
Personnally, I found that that the Stilleto cab has a lack of bottom, but this is all to my taste. I play a Rectifier Standard myself and the sound I've got is just huge. I had this cab runned by a Peavey Bandit Combo before I got my Mark IV and I didn't realise until now how huge this cab sounds.
It is a matter of taste. I would say the best you could do is to make sure that you local dealer has a Stilleto and a Rectifier Standard in stock ( you may want to try a Rectifier Traditional too, these are a lot tighter and focused), and you get there with your head, and just try. It is the best way to come out with the right cab. Because, such a cab is a real investment, if you don't like the sound it produce, you will be stuck a long time with this sound ( considering you don't sell it, because if not, it will never break... never!)
You may want to post your musical style so we could suggest you the right cab.