I have the Hegel h160 and found it to be a very good performer. The h190 made changes to the pre section I believe adding an additional power supply, supposedly tweaked bass response for listening at lower SPLs but I can't definitively say which I would prefer. I never found the h160 to sound thin in the lows or mids.
Either way, both the h160 and the h190 can be found at good discounts used. These amps are known to be reliable so I wouldn't hesitate from a used model.
I will be listing mine shortly as I have decided to downsize and seek speakers that respond well to lower power at lower SPLs where I listen. I also don't want heavy equipment anymore, I'm over 60 and want smaller and lighter.
That limits alot of stuff I have looked at such as some audiophile standmounts that purportedly need a higher powered, higher current capable amp to sound good justifying their higher prices, even at lower volumes, especially if they dip well below 4 ohms. That's a lot of constraints to put together a system that works well for me.
I could keep the Hegel as it has worked with everything well enough and has a good sounding dac that's still hard to beat unless you spend about a grand or more IMO, and then it could be more a match with a different coloration/flavor. The h190 has the so called improvements however incremental more or less they may be and its a newer model. Starting to see prices a bit under $2K used. So an h160 will have to be substantially less.
Either will give a taste of Hegel. If 40 lbs and higher boxes are not an issue, I would go for the power. Better to have it and not need it than need it and not have it. If lower power is sufficient, then there are alot of other options as well.
I preferred Hegel over Parasound for what its worth. There's so many others around 100 to 150 watts as well, Creek, Outlaw, etc. I would stay away from those with reliability issues or outdated parts. Not that any can't be repaired, it just adds to the cost. A good amp can sound good for many many years and not require repairs/maint. At least Hegel is known for reliability and most say a neutral, smooth but powerful sound. There are livelier amps, some darker, pick your preference.