That's too hard to answer. You have to know that Bodom is split into old and new Bodom. There is the typical neoclassical stuff, with lots of melodies, great solos and Alexis old voice on their first 3 albums which 50% prefer more and then there's the part the other 50% prefer more. The heavier albums (mostly in drop C) starting from 2005 till now. Those songs are heavier, other voice, more complex, (partly worse solos), more technical.
At last we have Hate Crew Deathroll which is in between old and new Bodom, but it seems that nobody's going to talk about that album. I don't know why because it's still good.
I'm more a fan of the newer stuff because I got bored about the old songs (except Everytime I Die) and, as a guitarist I find them more intersting. Guys like Joonas on the other side, can wank 24/7 while listening to the first 3 albums.
But I can tell you my favorite two songs of every album:
SW: Red Light In My Eyes Part.2, Touch Like Angel Of Death
HB: Wrath Within, Towards Dead End
FTR: Everytime I Die, Northern Comfort
HCDR: Bodom Beach Terror, You're Better Off Dead
AYDY: Are You Dead Yet, Trashed, Lost & Strungout
BD: Banned From Heaven
RRF: Ugly, Not My Funeral
HOB: Halo Of Blood, All Twisted