It's really hard for me to put these two in the same category. The Balvenie is twice the age and twice the price and are not really all that similar to each other. If you can find the Balvenie at the old price $80-$90, then it's a good value. When they repositioned it as a premium malt at $125-$135, I motivated towards Glenfarclas 21yo or 25yo as my favorite Speysider of that age range. As Bamber says, the Balvenie 15yo Single Barrel represents their range very well at a comparable price to the Glenmorangie PW, although no Port influence there. The 21 Portwood, while still a great expression with alot of character to show, has priced itself as an occasional dram for me. I did catch 2 bottles before the increase.
The Glenmorangie Port Wood Finish is a good variation on the 10yo, and I'll eventually try the whole range of wood finishes, but don't expect the same style if you try the Balvenie. I have notes on both if you want them.