Chieftain V5: Fixed vs Tunable?

I’ve been playing for less than a year, but have been enjoying it. I have the C/D Mellowdog Pair from Jerry Freeman.

I want to add a low D whistle and have kind of settled on the Chieftain V5 after a lot of research. I play by myself and with my family. That’s it, no sessions or anything else. Is he tunable worth the extra $s? Thanks!

Unless you are playing with other instruments, the tunable whistle version isn’t a necessity.

What instruments do they play? In particular, can they easily tune to match the whistle (violin/fiddle, guitar, flute, voice, …), or are they pretty much stuck with the tuning they’ve got (piano, accordion, bagpipes, oboe, …)? How fussy are you and they about slight differences in tuning?

Guitar, ukulele, harp, piano

And honestly, the tuning on my mellow dog hasn’t been any problem, so I would think the chieftain would be fine.
I just didn’t want to spend for the fixed, and wind up wishing I had gone for the tunable. Thanks.