I've got 2013 ZX 190 with the 175 HPDI. With just me on glass water I run about 62 mph. I've got no clue how someone with a 150 is running 60mph.
About the same with mine. Except for gas caps the 2013 and 2012 are the same. I added a 8' Talon and lost maybe 1 mph. On a cold winter day I can regularly hit 65 with just me. Hit 67 once. This is with a 24 pitch Turbo TXP prop. Skeeter over propped this motor with a 25M1. The 175 has a higher RPM range than the 150 and really needs to be around a 23 pitch or 24 pitch to get the RPMs up.
The HPDI has better hole shot and has the potential of more speed on colder days but the SHO fuel economy is better and will provide more consistent performance year round.
I think Yamaha learned a lesson and kept this smaller version more traditional in materials to avoid some of the issues that plagued the early big SHOs.
They have had 4 cylinder four strokes out for quite some time in the blue water market. They basically just took that reliable platform and re-tuned for the bass boat market.
I love my HPDI and it still starts with the flick of the key but I wouldn't hesitate to replace it with a SHO should the need arise.