I grew up with the stuff, which admittedly might make me a bit biased, but i really prefer Autosol.
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Through the years iīve worked quite a bit on older Brit and Jap bikes, which includes A LOT of polishing on aluminum and chrome...and in the last years quite a few Jensen boilers have seen attention as well.
Consider myself quite open minded, so i have paid dearly (postage incl.) to check out Motherīs Finest, Mass and SimiChrome, in order to hunt down the easiest/best stuff to use.
At first the Autosol cream appears to be quiteh identical to Maas/SimiChrome, but i still find that it is better at dissolving gunk (like black Esbit residue), and slightly more abrasive, which generally makes polishing faster, both freehanded and on the buffingwheel.
That said, on the old riveted boilers, i usually turn to less abrasive silverware polishing products, to avoid gnawing off the plating on the rivet heads.