2) Chassis. No matter what, the Fighter has more HP, BAB, and Strength than the Wizard,
Barring shenanigans, of course. With enough shenanigans I'm pretty sure you can win in all three while retaining ninth level spells.
Even with shenanigans, you have to start with Wizard (or maybe Bard). That pretty much automatically puts you behind the Fighter right from the start.
Let me put my monkey where my mouth is.
Let's take Meepun, the curious little white dragonspawn ice-dwelling desert* kobold. Now, meepun hasn't heard of soverign archewhats, so he isn't going to use them. He's going to use some
very rancid (but very RAW) cheese instead.
Build Breakdown
ECL2:Sorc 1 (BAB3) + level of sorc from white dragonspawn. Feats: Expeditious Dodge, lesser draconic rite, dragonwrought
ECL3:Cleric 1 (BAB9). ACF everything you can here.
ECL4:Singer Of Concordance 2 (BAB10) (buying off white dragonspawn). Burn a feat on combat casting. At some point, pick up iron will via otyugh hole.
ECL5:Dragonslayer 1 (BAB11). Casting as a fifth level sorc here.
ECL6-11:Abjurant Champion (BAB16). Pick up greater draconic rite, cast as a twelfth level sorc. Possibly buyoff more dragonspawn, depending upon which version you're using
ECL12: Spellsword 1 (BAB 17)
ECL13+: Whatever you want, really. As long as you don't dip excessively, you should be able to keep it up indefinitely
Either that, or artificer + renegade mastermaker + cleric buff abuse.
But yeah. Shenanigans. Not something I'd actually use.

*Fun fact: Antarctica is virtually all considered a desert.