Silver Wolf :
I agree that many of the AMD video processing portions are better, however in my home theater PC I not only play movies but I host and sometimes even use it to take home movies (not illegal duplication) and trans-code them and re-encode them to play on other machines. Due to the higher memory intensive applications, I find more RAM and an Intel CPU to be better than any of my AMD CPU's. I personally have gone from being an AMD "fan boy" to an Intel user. I no longer buy AMD CPU's except to do minor upgrades to older machines now. I am even about to replace one of my AMD systems motherboard, ram and CPU to be Intel based CPU/Motherboard (and it uses DDR3 instead of the older DDR2 in the AMD system I have).
I would go with whatever your budget allows, but I would recommend an Intel if you plan on doing more than watching movies. I have used even older Intel integrated graphics from before the HD integrated in the CPU and still been able to view movies in HD quality.
Without question, a good Intel processor will do wonders in terms of processing power, and their HD graphics aren't bad at all. However, buying the best comes at a price, and in most situations an AMD processor/APU can get the job done just fine for less $. For an HTPC, that will likely just sit and playback video, there's no need for top tier performance. And even for gaming, (lacking a discrete gpu) a good AMD APU will give better graphics performance than any similarly priced Intel processor.