I went through a pretty exhaustive process of trying vintage hohners, suzukis, yamahas and then sprung for a new Hammond (suzuki) Pro44 HP. I did this mainly on the strength of how the upper end suzuki’s sounded and having been lucky enough to score an unused vintage suzuki that I fell in love with, that sealed the deal for me.
At the high end, either yamaha or suzuki are both good options. If we look at what Oscar (melodica me) is playing most of the time for gigs, he is using Hammonds, either the Hyper or the Pro44. Jon Baptiste, also favours Suzukis… Yes it is about twice to thrice what you might pay for a high end suzuki or Yamaha but the overall result is worth it in my opinion.