I've enjoyed this series in and off for a while now, DW8 will always be my favourite, but I enjoyed SW4 too.
When it comes to Musou though, I'll always enjoy the crossover titles with IPs I know and care about over Dynasty Warriors proper.
As for the new project, it's clearly gonna be DW10, but after DW9 and how bad it was, I don't think I care to know.