In my experience the Deveaux scale is a good option. Essentially it helps you play in tune. I had a nice older Haynes flute and when i changed to my new yamaha the pitch was just much friendly for ensemble work. it could have been my specific haynes versus this specific yamaha but you may wish to investigate.
What is traditional vs. modern scale?
A very long subject, but the short of it is in the late '70s Albert Cooper with Rudall-Carte developed the Cooper Scale. This was not a change in scale but a new scheme for the location and size of the tone holes on the flute body. This arrangement raised the traditionally flat notes at the lower end of the instrument and lowered the traditionally sharp notes. The Cooper or modern scale is also called the Deveau scale by some manufactures. The modern scale can be made in various pitches. (A-440, A-442, A-444, A446)
Do flutes improve with age like violins?
In short, no. The long answer is a 30 year old student flute will only play as good as it's mechanics will allow, and at 30 years old it would be showing wear & fatigue and a newer student flute will play circles around it. In addition there have been many improvements in head joint and embouchure hole design so a newer flute has advantages here as well. In the case of expensive hand made flutes, they may or may not play as good as their modern counter parts but they will not "improve" just due to their age. In fact the modern scales and higher pitch of the newer flutes make it a better choice in most cases.
taken from the FAQ of flutesonline dot com.