If you are simply a Y pax with no CX MPC or OW status - I am afraid you won't find CX's Y service more impressive than BR/CI.

In fact a couple of my Taiwanese friends (all non-CX elite) rate CX's Y service (purely talking about services not the hard product) below BR/CI/QF/JL in a recent discussion. They were not related though - everyone of them dislikes CX for a different reason.

Even my mum doesn't like it - I used my points to get her Y redemption long-haul tix on CX and she doesn't want it anymore after flying. Apparently CX crew failed to deliver her cup of water after many times of requests. But she did mention that the guy sitting in front of her, who sounded like a DM/GO to me, got distinguished services: was offered choice of food and the crew continued offer him the drink without him asking...

However as a MPC elite myself, CX has treated me well and I won't complain about it. I never fly long-haul on BR/CI so can't comment.

If you switch to CX and obtain GO/DM, your Y flying experiences with CX will be good enough for you to stick with them - they do look after you both on ground and in flight and you probably won't find a match from the services that its competitors offer.

If you fly CX in J/F - the experience is good as well. I have never took J on BR/CI but I personally prefer CX's J service than SQ/MI/MH.

If you fly CX in Y with no status - good luck with it. I don't think it's bad but I really donno if it's much better than BR/CI.