Boost Converter: Low voltage high current VS. High Voltage, low current?
Boost converter losses are lower when boosting less .This is still true when switching loss reduction schemes are employed .Your proposed parallel circuit is safer due to its 35V output .This should make product approvals easier .The expected PWM     duty cycle of your boost converter is still less than 50% at your proposed 35VDC out so stable operation is to be expected .Unless you have really long cabling requirements go for the low voltage .