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I generally fit genuine unless it is really too expensive. I made the mistake of ordering lots of parts without checking and ended up with a lot of britpart parts which were simply terrible, didn't fit, broke in my hands while fitting (I'm gentle) or didn't last.
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I replaced my old ignition switch which had been on the car thirty years and had decided to fail.
The replacement Bearmach didn't last thirty days.
Bought a more expensive OEM brand in a box with that distinctive Landrover logo pattern. It was easier to fit and is still working.
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I think the other thing to keep in mind is how long it takes to remove & replace said part .... if it's a major time consuming job, I'm not going to use a cheap aftermarket part, only to have it fail 12-24 months later, and then have to do it all again ... ie:td5 - fuel pump, water pump, fuel pressure reg', etc, etc.
Even worse is when you're paying someone else to do the job for you.
Dad & Grandad always said ... "buy cheap, buy twice"
If it's a 5-10 min job to remove and repalce, then maybe I'll risk it.