Classical defense chopping far from the table and chop & chop-block close to the table aren't full compatible requiring different blades & long pips rubbers....
Yes, not also different glue: delayed DHL delivery (incomplete address) so contra said my address too long...and complained about the different glue without any answer from Kjell of Contra but you know what are they thinking about the southern people or Europe....
Depends what blade you can use. I'm a backhand chop-blocker close to the table so can't use a very fast blade, also don't like Euro/Japanese rubbers because aren't linear, so I like Chinese but with booster isn't enough.