I've used both extensively and if I had to choose just one I would go for the Flex PE14
- Lower RPM range
- Can handle 1" pads to 8" pads
- Can do headlights, boats, car paint, metal polishing
I show this tool a lot in my boat book and personally use it as my first choice for a rotayr buffer.
See this thread...
How to buff in tight spaces using a rotary buffer
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