You mentioned that you'll like to choose a racket for long-term. How long is the long-term - 1 year, 2 years, 5 years, 10 years...
I have the Astrox 77 Pro and Arcsaber 7 Pro, and also an Arcsaber x Play. I like both rackets.
The Yonex website says for both the Astrox 77 Pro and Arcsaber 7 Pro is medium flex; the Astrox 77 Play and Arcsaber 7 Play should be flexible or hi-flex.
In order to help you, hopefully - do you play doubles or singles more? I myself play doubles most of the time and I prefer the Arcsaber 7 Pro over the Astrox 77 Pro. My reason is, after 50 years of badminton, I no longer can smash as I used to... and being (much) slower and muscles lacking, the Arcsaber is much easier to use in a variety of situations. In my case, my long-term racket is the Arcsaber.
Of course, your situation is different - your weekly sessions, your play style, your training plans if you have... should contribute to your decision.