I have both the King marching trombone and the Blessing marching baritone. I also have many, many mouthpieces. The intonation of each horn is fine. I don't think a 6.5AL is appropriate for either. Most jazz players use a 12C or similar.
Regarding the Lake City flugabone. I was put off by the cost. My Blessing was under $300. My King was somewhere between the Lake City and my Blessing in cost.
Now about sound and mouthpiece choice. It really comes down to what you want to use it for. I've also got a very old Conn upright baritone. I play my horns in a trad jazz band, either playing the trumpet part or the trombone part.
The marching trombone can be a bit nasal in sound, again depending on the mouthpiece. The marching baritone has a larger, more sonorous sound but does not project as much as the marching trombone. I enjoy playing them both. If I was going to play a more modern jazz, small group combo style of gig, I would go for the marching baritone. And then there is a blending or not blending issue. You pick your weapon of choice for each situation.
Richard
King 1130 Flugabone
King 2280 Euphonium
King 10J Tuba
Conn 22B Trumpet
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