So far my favorite houseplant is my Doritaenopsis. It has nice blooms which lasts for months and loves being indoors by our west facing window. But as everyone said, it is hard to really choose just one favorite, there are good runners-up for me like my Dracaena sanderiana, Dracaena marginata, Phalaenopsis, and my newest addition the Hoya kerrii with its lovely heart shaped variegated leaves, I heard it has lovely blooms, so that would certainly bump it up in my favorites list when it comes.