Short answer: and so say all of us.
Long answer: It all depends on what you want, for racing a very low polar moment (low = easy to rotate) is good because you want to be able to change direction very fast. A 911 (series) can turn very quickly because it is rotating about the engine rather than having to move the engine (mass). At the same time, it can be a real handful unless you know how to drive it since it tends to understeer when the power is on but if not careful can snap into overseer and then you have a front engined car with rear steering.
This translates to very late braking, establishing rotation while still braking, and easing the power on as you unwind the steering. There are some people who can properly drift a 911 but there are not many and is rarely fast.
OTOH, for stability most people would rather have a car that has a slight understeer and a high moment with some self-centering (caster). This will turn easy at sane speeds but tend to go straight down the Interstate with little correction.
I have had cars with front, wing (Jaguar XK-150), and under the seat (well a little behind - MGA) batteries. Single, dual, and triple. The best thing about putting the battery under the seat (as long as not over the catalytic converter) is that it will not be exposed to under hood heat and will last much longer. Also AGM batteries are usually sealed so will not outgas (sulfuric acid is not good for anything outside the battery, is why battery trays corrode). Drag racers with live rear axles put the battery over the right rear tire because just adding weight is usually illegal.
Bottom line, in the Heap it really does not matter except that putting in a cool place is good for battery life. I also like AGM batteries (have a number of Optimas) but like anything else, how it is built will make a big difference in life. Have not had mine out so do not know who made it but would not be surprised if from Johnson Controls.
Just a side note: AGM batteries generally want a lower charging voltage (13.2-13.5v) than a conventional battery which is why a standard charger should not be used except maybe for a short jump. The chargers I use for long, slow charging (B&D "Smart" chargers) have selection for wet, gel and AGM.
I have used little inexpensive 50ma "float" chargers on everything for a long time. They are non-specific but the charge rate is so low that it does not seem to matter. YMMV.
(long way from "Easter Eggs").
One of these is a diesel.