Teddie don't get me wrong. In our league the clubs are free to choose if they use C-Balls or P-Balls, so most clubs still go for the C-Balls since the P-Ball quality used to be so inconsistent, but not all clubs do so. Some use P-Balls. So IMO it makes the most sense to either choose a c-ball or a P-Ball that behaves pretty much like a c-ball and not a ball that bounces so weirdly.
Our club also has a few of the XSF balls, and I agree it's a very durable Ball, but IMHO that's not the only criteria that defines a good ball.
The XSF used to be my favourite P-Ball....
....But that was before I knew the G40+ and the NP40+ (Nittaku Premium 40+)
After getting used to these balls suddenly all the other balls felt literally like sh*t.
The balls you mentioned are either seamless rebranded XSF (there goes that weird bounce again) or seamed chinese balls (i know this sounds hardly possible, but even weirder bounce)
Someone who is a well respected person on different tt-forums wrote that the best thing would be if the chinese P-Ball manufacturers would stop making annoying balls and instead make something more pragmatic from them.
[Emoji6]
.....My personal assessment remains that the world would be a better place if all Chinese seamed balls, including the newest DHS, were re-purposed to make other plastic objects, like buckets to hold balls, or objects unrelated to table tennis.
Personally i think Baal wasn't very wrong when he wrote that...
[Emoji2]
And oh yes, one more thing: the NP40+ is slightly smaller than the other balls, so of course it should feel closer to 40mm c-balls, since it's actually a 40mm Poly Ball and not a real 40+mm Ball...
Just my 25¢
Edit: here's a link to that thread. One might find this interesting.
http://www.tabletennisdaily.co.uk/forum/showthread.php?10404-Which-poly-ball-should-you-choose/page4