Okay, I did some more testing, the default voice on PSRS 970 is Concert Grand, and on DGX 230 is Grand Piano, so that is not a good comparison, however PSRS has Concert Grand also and both also have Midi Grand, so I compared them that way to be fair, and turned up the volume all the way on both, the result, loudness on both are about the same according to my ears, even though DGX is total of 12 Watts and PSRS 30 watts, I also increased the volume setting of PSRS to match the default setting of DGX which is 114. So at the end like you mentioned players spend lot of time tweaking the sounds and styles to their liking, and I guess that is what I'll be doing. For people that just want to select a style and play, DGX much friendlier, and I was thinking about selling that one when I purchased the PSRS, but more and more I like it so much specially having the 76 key that I have decided it is a keeper. Also some of the Styles introductions and endings are so much nicer, but that is a different subject and I have to see if I find a way to transfer the ones that I like to PSRS if it is possible, I'm just a beginner at keyboard but been playing guitar for most of my life.
Thank you and have a nice day.