I have been playing for 12 years now. If anything, my playing has been handicapped by playing multiple flutes in the quest for the “magic flute”. A wiser me would have realized that it’s time with the flute, not the flute a lot sooner than I did. Nevertheless, slow and expensive though it was, I am getting to the point where my sound is much better, more stable, and more reliable. I say this so you can discount what comes next accordingly:
The reedy sound is available on all but defective flutes. Sometimes easier, sometimes harder. I have a wooden cylindrical Boehm-like bore flute (Worrell) and it can sound very reedy-it just takes more effort than getting it to sound like a Boehm.
Some flutes are more approachable than others and my experience is that these are more rewarding to start with, but the temptation is to stop too early without learning how to get from good to great.
Some flutes (e.g. Rural and Rose originals or some modern copies) are less approachable, but the reward of persistence is a great tone that can be transferred to any flute.
Notwithstanding the previous sentence, I use modern heads on the two antiques (R+R, Siccama) because it makes a difference to me.
The Siccama is made by John Hudson, who made the Pratten’s perfected for Boosey, and has the same bore as the Pratten. It’s a really great flute, no doubt about it, and a modern head doesn’t make a lot of difference. The Siccama, plus some needed repairs + a modern head is still less than the cost of a new modern flute. However, it’s rare to get an antique that is ready to go, without investing time and money in it.
While my 2 flutes are antiques for emotional reasons, reason tells me that the very best modern flutes are better than the majority of antiques.
My gratuitous advice would be to get a Morvan (one for sale now on this forum from someone who lives in France…).
Hugh