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Previously I had Kreisler's Liebesleid from a charity shop and subsequently bought the Schott Schoen Rosmarin and Liebesfreud from Amazon because they form a set of three old Viennese dance pieces.
I also had Elgar's Salut d'Amour in an old ABRSM grade 5 book minus piano part, so I decided to buy the Schott edition. Big mistake on various levels.
The ABRSM version was in D. The Schott 1899 ed was in Elgar's original, less tractable, key of E. The main difference is that in E there is an unimportant harmonic passage which probably can't be reproduced in D, or isn't worth the effort. More annoyingly, I find both versions are in IMSLP, something I should have thought of before buying any of the above-mentioned four pieces anyway.
Annoyingly, even Itzhak Perlman plays Salut in D!
I would guess that G could be the best key on a viola or a cello, although IMSLP has E versions. Maybe G is too low. Maybe IMSLP has others: I haven't checked all of them.
and here's Perlman: -