I doubt (but am ready to be proved wrong when it gets measured) that the Neurochrome input boards are going to outperform the Purifi eval module. Take a look at the datasheets for the OPA 1612 vs the OPA LM4562 used on the Neurochrome buffer for starters, and the discrete regulators on the eval board might be an advantage as well (of course one could use to choose Hypex regs for the Neurochrome).
What the Neurochrome offers is more flexibility in layout/design, the ability to make a dual mono amp, or mono blocks. Additionally, I believe the Neurochrom boards are made in Canada, likely to a bit higher standard of quality than the Asian made eval board. Making boards in NA is quite a bit more expensive than making them in Asia, so one has to expect to pay for that difference.
Neurochrome's work is usually really nice, so I do suspect these boards will be worth the asking price.