http://nwn2db.com/build/?153321
http://nwn2db.com/build/?153320
"A's" front-loaded for Empower Power Attack while still "squeezing-in" Greater Weapon Specialization, Weapon Mastery Slashing, and 1d6 of extra elemental damage by level 20 (..and without spending anymore than 12 levels of Fighter on the class). (..though you won't get that elemental damage in the OC, but you'll have it in MOTB about the first time you meet Okku at the start of the campaign.)
"A" obviously needs a LOT of help with enchanted items for defenses, but by virtue of it's race - still has the #1 defense: Spell Resistance from the start.
The real entertainment value on a build like this is seeing a critical in action with the Scythe. If you've not seen this before it's sort of "breathtaking".
Assuming properly equipped, "A" is the better character. (..and notably with respect to the final battle in MOTB, "A" has the superior Disarm grouping where B's "Knockdown" isn't as good.)
B is far more balanced through the use of it's spells at lower levels. Barkskin and Protection from Alignment are the primary spells, but save-spells like Conviction and Nightshield are also quite useful.
B has about a full level penalty (added to the racial penalty) arising at the end from 5 levels of class penalty at 20% per level. Effectively however, it's only 4 levels (26-29) because the 5th doesn't count (..at that point you are "at" level 30).
B also has a better attack structure than represented in the builder profile. This is because of the feat Forest's Hammer which provides attack bonuses as the Forest Master build progresses.
As for "buffs", before level 18 - yes (which is 2-3 levels latter than most enchanted items in the OC). After level 18 its totally optional. HOWEVER, the long-lasting Conviction and Nightshield are still useful - particularly when you consider that this build has Evasion.
Also, the AC profile as shown is misleading - the natural AC bonus (provided by the Forest Master) doesn't stack. On the other hand it does provide +2 more than anything BUT the spell Tortoise shell can provide (..basically the same as the Druid's optional Oaken Skin feat - except always-on.) Also, this bonus is provided at character level 14 instead of 18.
Note: that "B" will need a Wisdom modifier to cast 5th level spells (if desired).
I tested both builds up to level 21 in Vordans with various monsters. Both are more than adequate most of the time. The one exception is Mental effects. "A" is horrible until it gets an enchanted immunity - at least against effects that aren't spell-based (i.e. Ghast Dazing). B is only workable with Protection from Alignment.
Also, practically speaking "A" will not have access to either Evasion or Improved Evasion until (optionally) starting a fight with the Troll lodge in MOTB. This makes "A" ALSO more susceptible to reflex save spells/traps that aren't negated with spell resistance. (..though most will be.)
Final note: I'm not sure if Great Strength extends to +7 or not in-game (..so the +6 and +7 Great Strengths will need to be checked first before finalizing).
I'll be removing both builds in a few days, so if you want to look them over longer then use the websites "Copy" function.
