Don't get me wrong, but I like both. But the winner for me was the Baltic Porter. And who knew each style would synch so well with the pumpkin flavors?
I didn't have them this year, but I had them both last year and thought the Baltic Porter was really good.. didn't like the Tripel that much..
I didn't find either too memorable, but looking at my notes, it seems that the tripel was a bit lacklustre---like they used a really neutral yeast, maybe, and didn't bother hopping---while the porter was 'pretty good'. If you like the porter, give Midnight Sun's 'TREAT' a try.
In general I have found that porters and stouts taste the best with pumpkin flavor. Something about that dark, malty backbone that really melds well with pumpkin spice.
I like the Porter a little better, but I just recently mixed them together and had an interesting hybrid blend