Shadows reduce solar panel output significantly. I'd go with the 135's for
redundancy and you will still have whatever output one panel can produce
for a given sun angle with a shadow on the other.
In the real world panel output is much less than the ideal conditions rating
by the manufacturer. I have 6 65 watt Kyocera's. Today at noon in South
with the Sun getting pretty low in the sky, my panels gave me a bit
over 15 amps into the batteries at 13 volts. That's about 50% of the array
rating at peak sun. I have two Morningstar MPPT
controllers with 3 panels
on each controller. The controllers say they generated 80AH so far today
with some morning shadows from the ketch
masts and rigging
on the boat
in the next slip to the South.
Fit as many panels as you can!