I've researched and listened to both pieces of equipment (family actually owns AVR 225). You are correct in stating that the Onkyo has a better feature set. In my opinion, the Onkyo is better suited for home theater. However, I think that the HK is a superior music receiver. It sounds more welcoming and musical (and warmer). I think it also has equivalent to better power reserves.
If you're going to do lots of movies and flexibility is important to you, go Onkyo. If you're big on music, my advice would be HK. However, you should hear it with your speakers and pick from your tastes.
A quick tip-I heard the AVR230 is identical to the 225 with a new face. If you like the 225's looks, you may want to search for that on discount.