why would higher voltage be a problem? It might change the stringing if you are using a string inverter, or selecting the correct micro-inverter in you go that route… but in general the higher voltage (and output) is a GOOD thing because you need fewer panels to get the same output which means lower current and less labor with fewer panels. That being said, I view the max3 400w module as a marketing mistake just so they can say they have the most output in a single panel.
In our Dealership however we do not promote use of the 400w panels because they carry an (unreasonable) premium in price/watt over their regular 96cell modules… they also are physically larger, which tends not to fit as well on residential installs. commercial installs don’t use them much because of the price… preferring the lower efficiency of the P-19 because of the lower price.
technically I would compare the Sunpower 365w with LG Neon R 370w… giving the edge to LG these days because of wholesale price gives a little better margin with very nearly identical specs. The LG Neon-2 340 is even better, with only SLIGHTLY lower efficiency and slightly higher degradation. The LG Neon-2 340w are my current favorite product for best margin to Installer and best long term value to homeowner.