Handling is more about suspension setup and tires than which end drives the car. most every car comes with understeer dialed into it from the factory, as that's a safer situation for the average driver. Oversteer can be fun, but it's much more dangerous.
There are good and bad in all types of platforms. You can't say, "if all else is equal" because there aren't going to be any cars out there that you can compare with all else being equal, so you will ALWAYS be at the mercy of how the engineers decided to set the car's suspensions up or the bean counters decided to supply the tires. Which means that it's really a moot question in the real world.
I have found a test between two equal IMSA cars, based on the same chassis, with the only differnce being the drive wheels:
The problem is that this test is from 1988, and suspension setup has progressed considerably since then, and FWD cars work even better than they did at that time.
Nose heavy cars tend to understeer more, regardless of where their drive wheels are located. Putting on stiffer springs and larger rear swaybars can overcome that (the ITR and SVT Contour are two of a group of FWD cars that have had that done, stock, and are on the ragged edge of oversteer even though they are nose-heavy FWD cars).