We don't know all the details like how good a player you are, what do you want to use it for, etc.

I have a Korg Pa1XPro. New, it cost about three grand and I bought it used for $1,300. It takes a good, experienced keyboard player to get the most out of it. If you're just messing around with 3 fingers or something like that, no way. It will sound like a toy. That PSR you're asking about costs about $250. I'm going out on a limb and will say no way will it give you a better sounding arrangement than Biab will. Note I said arrangement not just sound. The sound quality with Biab is completely dependent on the quality of the synth you use with it. If you only use the built in Windows Wavetable it will sound like a kazoo but if you were to play Biab through my Korg then the sound quality is very good but the arrangements are generally better in the Korg in my opinion. You won't start beating Biab with an arranger keyboard until you move up to the big boys but you're talking big bucks.

That PSR you're asking about is from Yamaha's consumer line of arrangers not their pro line. The pro line of any of these arrangers like the Yamaha Tyros, the Roland G70, the Ketron Audya or the new Korg Pa3x are much better than Biab to me at least but then I know how to play them. If you're not a good player then Biab will give you some very good complete arrangements to have some fun with.

This is my usual convoluted way of saying in answer to your question, "it depends".

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.