Personally, if you haven't shot either, the 357Mag is the way to go. It is much more versatile than a 44Mag. The 357Mag can be loaded with cheap and accurate low-recoil 38spl loads and you can even use +p 38spl loads for self defense. You can also use standard 357Magnum loads for self-defense. The 357Mag in these loadings is said to be the best man-stopper in a handgun platform. You can use hot 357Mag loads that put out about 600-700ft/lbs of energy for hunting. The 44Mag is strictly a hunting revolver. It isn't practical for self-defense. You can also shoot and practice with the lower-power 44spl but it costs just as much and is practically unavailable. Common 44Mag revolvers tend to be much bigger and heavier than 357Mag revolvers. In my opinion every gun owner needs to have a 357Mag just for its excellent versatility. If you aren't reloading then the 357Mag is the obvious choice because you will end up shooting it a lot more.
357 "standard" load: 158gr@12-1300fps 450-500 ft.lbs energy
44 "standard" load: 240gr@13-1400fps right around 900-1000ft.lbs.
First of all, the ft/lbs of energy for the 357Mag loads you quoted is way off. It should read 500-600ft/lbs of energy and that is not a
standard 44Mag load. The standard 44Mag load is 240gr @ 1180fps out of a
6.5" barrel for about 740ft/lbs. Also consider that 6.5"-7.5" barrels are used for 44Magnum testing while 357Mag loads are rated for a service-size 4"barreled revolver. Is that really a fair comparison? I will agree that the 44Magnum is a better hunting cartridge because it is bigger and has more momentum and energy than the 357Mag but it
does not have several hundred more ft/lbs of energy than the 357Mag.
Note that the 44 magnum produces almost twice the energy of the 357
Not true in any way, shape or form.
The Federal 180gr. 357Mag load is pushing 623ft/lbs out of a 4" barrel and about 720ft/lbs out of a more 44Magnumish 6" barrel. I don't think it safe as a direct comparison to say that the 44Magnum has
twice the energy. It doesn't. Actually when comparing similar barrel lengths the 44Magnum produces
slightly more energy. Keep in mind that the typical 357Magnum loads are watered down and designed as
service loads as it was one of the most prolific LE cartridges of the 20th century. The 44Mag was specifically designed for hunting, thus using stouter loads. 357Mag and 44Mag hunting loads out of similar barrels are quite similar actually. How could they not be? The case length for both cartridges is exactly the same. The
original 357Mag load was 158gr @ 1550fps for about 840ft/lbs of energy.