I didn't like the Japanese UCCI reissues that I've heard, they sounded harsh to me, with boosted highs. The American digipaks that were mastered by Erick Labson in the mid- and late 1990s aren't my favourites either, but to me they sound better than those Japanese ones and they're cheap. Other board members' mileages vary
Until something better comes along, I generally prefer the 1987 (32XD prefix) or 1991 (MVCI prefix) Japanese Impulse! CDs; as far as I know they share the same masterings. I don't know which Pharoah Sanders and Alice Coltrane albums, if any, were released in those series, though.