From my experience, stay with Troll. Just get bronze weapons/shield. Of course, bronze armor would make it a little easier in the next biome, but at least for me, the armor difference (and the reduced movementspeed) doesn't justify the effort to get hands on the necessary bronze.

Better be a little more careful with your first explorations and think about a propper peperation until you get the iron armor.

@Marauder, I agree with you on the power of shields, still some armor is helpful, especially if you get hit trough the block.