Which one is better the Greataxe, or the Lightbringer Greatsword OR the Doomblade Greatsword
I'm confused on what hits harder, it looks like the simple Greataxe does a good bit of damage but the others are harder to obtain....thinking LIghtbringer since it probably is good against undead.
ALSO, I read that 2H weapons are not as good as dual wielding or sword and board...true?
THANKS!
IMO, the Great Axe of Sharpness>Lightbringer Greatsword>Greatsword of Doom. GAoS is +2 to hit, +2 damage, and an additional die (d10) of lightning damage on top of that. LB greatsword is +1 to hit and an additional die (d8) of radiant damage on top of that. All the doomblades have no bonus to hit, don't count as magical weapons (I think), and do bleeding damage over subsequent rounds. While the bleeding damage can add up over time, enemies shouldn't live more than a round or two once you started focusing on one in particular anyhow. I usually get the ingredients to make the LB greatsword first, make that, and then have my 2H pally user carry it until after Coparann. I don't bother with the doom blades at all. Note that a great axe does 1d12 of damage, average 6.5. A greatsword does 2d6, average 7. So but the greataxe has a better to hit bonus, +2 to damage, and a better die of additional damage (d10 averages 5.5, where d8 average 4.5), I would prefer a greatsword, but not given the options in Solasta. The LB greatsword works great though against enemies who are susceptible to radiant damage or immune to lightning.
As for 2H vs. Sword-and-Board vs. TWF, I use Sword-and-Board on my pally until 4th level. Then I take the follow-up strike feat. That gives me an extra (half) attack, but the pally can still smite on that attack. My Ranger uses TWF. That's just my RP preference, however. Sword-and-Board with dueling style fighting also works, especially given that some of the best weapons in the game are one-handed, non-light weapons.
Although the Great Axes seem to do more damage over all, I've been using the Lightbringer with my Paladin. Without spoilers, there seems to be more than enough enemies susceptible to radiant damage and it is easily obtainable un like the Axes. I've also found that my Paladin's AC is high enough that I generally maintain 2 handed weapon over sword and shield. Just better damage out put. Makes battle end quicker. Despite never really using it I maintain a Warden Blade and Shield equipped as secondary kind of a "pull in case of everything has gone wrong" back up plan.
If you can afford (in terms of armour class) going the 2H pathway, keep in mind that any greatsword benefits from the Great Weapon Fighting style much more than a greataxe. See https://rpg.stackexchange.com/questions/120604/is-greatsword-superior-to-greataxe for some math and pictures explaining why it's so.
Personally I've found that in mid-to-late game, the weapon's enchantment level doesn't matter much as long as it's magical. The +1 vs. +2 To Hit difference from the weapon results in something like +10 vs. +11 on character's To Hit overall. It's not something worth pursuing; you will get much more from attacking with advantage, for example.
What does matter is a solid elemental damage bonus, and Lighbringer is quite good at that. Also, it's not just about undead; there are very few, if any, enemies in Solasta that are resistant to radiant damage. I'd say it's a pretty solid investment across the board.