For the skills golems are used to train with Warriors, you will be gaining in TWO TO FOUR major skills simultaneously.
Weapon
Tactics
Lumberjacking (if possessed and using an axe)
Anatomy (unless you are running a no-healing template and are forgoing the skill%/2, +5% at GM+ pre-DI mod to base damage from Anatomy)
Bushido (if running a Bushido template, and using stuff like lightning strike).
The latter two might allow some tertiary gain from your mana use in Focus or Med, but anyone can gain those to GM+ in a day.
Rarely, Magery over GM (add -29 mage weapon that's 100% poison, it's quicker from the lack of mana needed) is trained this way, but it's a special case.
AND, you end up with a choice of sitting there monitoring the situation, with the only gainful pursuits being chatting or menial, manual, crafting - or being AFK, risking sanction from your illegal action, and potentially wasting hours because you hit training goals, and the character wastes hours bashing for little gain, that could have been used to play attended, killing things that are in your gain range.
BUT...
If you are actually fighting stuff that fights back, you get to use your full skill set.
Weapon
Tactics
Anatomy
Lumberjacking
Parry (as the golem is based on tricking the AI to not attack you)
All casting skills (not just Bushido), as some will only be trainable by casting spells that buff damage or debuff the target, that would break the golem method's defense, AND their support skills (Eval, SS, etc.) without resorting to skill agents or illegal methods.
Any barding skills your warrior might dabble with
Focus (and med, if you are using mana for buffs, debuffs and special moves)
and so on...
With the Crystal Ball of Knowledge, you'll gain more warrior skills, faster, NOT using a golem, but adventuring, PLUS have the benefit of looting corpses for financial gain (gold, leathers, and so on). It's a no-brainer.
Personally, I only golem trained for 1 week. I wanted to finish up my Archer (note, he's STILL not finished, 7 years later) and my non-combat LJ in the week prior to the launch of ML. Frankly, after seeing how hard Yew wood & higher were to find (especially in those first few months), it wasn't worth the hassle.