Neonchameleon
Legend
Tell the dragon (who has wiped out all your hirelings and dogs in one breath) that, and he shall chuckle.![]()
Why were we getting that close to the dragon?
Now add the typical constitution bonus, and yes, you probably end up with three times the hit points.
Do you treat Method V of stat generation from Unearthed Arcana as normal then? Because that's the only way I can see this assertion being valid.
In AD&D for a fighter Strength is the most important attribute IME. For a Wizard it's Intelligence. Dex and Con are probably next for both (especially for the wizard as it's their non-casting attack stat).
And you get no bonus hit points for Con of 14 or lower. Using 4d6-Lowest, the chance of a given roll getting 15 or more is 23.2% (3d6 it's 9.3%). And a 15 dex won't help a wizard significantly (-1 AC) but will give them a 40% boost in hit points. On the other hand -1AC helps the fighter and gives a less than 20% boost in hit points. So the wizard is more likely to, if they have a second stat of 15, allocate it to Con than the fighter is. (Almost half of all rolls of 15 or higher are 15).
So by random generation in any sort of order the wizard is as likely to gain bonus hit points as the fighter. With optimisation the wizard is more likely to gain bonus hit points than the fighter (except under Method V from Unearthed Arcana) - it is simply more useful to the wizard. And unless the fighter is lucky enough to have a 17 or 18 in Con (which, as mentioned, is not their primary stat) the wizard gains a much bigger proportional bonus to hit points. (With both having an 18 con, the wizard still gains a higher proportional bonus to hit points even if the fighter gains more hit points). There is literally no official method of generating ability scores that means that the fighter gains disproportionate hit points over the wizard other than Unearthed Arcana Method V. (The only exception is that the "in order" stat generation where your only exceptional scores are con (or con and cha) might default to fighter).
And even using the pregens listed, the fighters have only approximately twice the average hit point bonus - which is not even enough to keep them up to the bonus from hit dice size.
Also I'm amazed about the escalating hit points for fighters example in 3.X. I thought everyone wanted enhancement bonusses to Con. And the squishies get a disproportionate bonus out of them. 2 hit points/level proportionally helps a wizard far more than a fighter. And there aren't that many other ways to gain hp.