The H1C's map is the middle to upper teens of boost for efficiency. The stock HX35 is rated into the mid 20's, however, with the addition of larger compressor wheels that can be extended into the mid 30's of boost psi.
Remember, "to make power you have to make boost". The HX35 is a later model turbo and there are many variations of it available so cost is a little less in some circumstances.
The 16cm hot side housing works well in most applications and is a compromise when towing and running lots of fuel. In a daily driver application a 12cm or 14 cm would work better and be a little less smoky but the drive pressure will get high fast if you are fueled up.