Our favourite is Celebrity with Princess being a close second. For us, Celebrity ticks all the boxes as far as the ships and the onboard experience. Staterooms are definitely nicer on Celebrity. Food used to be better on X but now not so much. Edge class ships are marvellous. If you sail on Beyond you will probably be privileged to have Captain Kate at the helm. She is probably the most personable and dynamic cruiseship captain you will ever meet. That ship just feels special because of her presence onboard. This would be our choice.
I have to ask why you’ve chosen Concierge class. You really don’t get much, unless you love the cabin location. Other than that, the rest is really just fluff. I would take a standard balcony or upgrade to Aqua Class, if only to get Blu as a dining venue. To be honest, we stopped booking Aqua because to us the food in Blu just wasn’t worth the hype anymore. But, that just us, as some people still love it.
Also, there are standard balconies available not only Infinity balconies. We like the ones aft on deck 6 close to Eden.
I think you’ll find that Princess and Celebrity are quite comparable and you would enjoy either one. Just do your homework and choose whichever ship gives you more of what you’re looking for.