Hmmm, well, imho, I'd suggest that it is always true.
The mac portable may be more prone to cap issues and electrolyte damage (I haven't repaired any of those), which certianly could tilt the decision, but I'd be loathe to repair a machine that is working properly with no signs of leakage. That said, in this instance I'll defer to your experience with these particular machines.
Have a great day