I have listened to both at an average acoustic venue (dealer) driving Salons. I also listened to both driving the Genesis V (the main spkr of course, not the subwoof). Finally, let me say that although I admire the Salons, for some strange reason I never managed to get to like their sound... BTW I listen to and judge by classical music and a bit of blues.
SO: with the Genesis, the Halcro was better (harmonic texture, detail, upper register, voice/violin/cello). The Lev sounded darker.
With the Salons: tough choice. The 33 sounded superb and so did the Halcro. I'd say the Halcro was better in the upper mids onward (say +3-4kHz) making the sound slightly more alive. I could say the Levs had the edge lower mids-bass. Dynamic swings were excellent, esp with the Levs.
Note that when I say "better" I mean very SLIGHTLY superior to MY ears -- for you that should mean "possibly" or "probably".
Final considerations: Revel & MLev were "related" products, so it may be that ML were used in voicing the Salons. IMO the 33's are by far the best ML product BUT, as always, YMMV!