I'm sure everyone here has an opinion on this subject, based on his/her experience. Here are my thoughts, based on many years working service at a full line GMC dealership:
1) OEM parts fulfill the original build specs
2) most aftermarket parts are, theoretically, copies of OEM parts and specs
3)
some aftermarket parts
improve on OEM design
4) aftermarket inventory often condenses similar designs into a single replacement part (not necessarily a bad thing)
5)
occasionally, aftermarket parts are constructed/assembled with inferior materials, techniques, workmanship (don't meet OEM specs) - more of a problem with recon parts
6) the aftermarket thrives when the OE downsizes older inventory (typically after 5-7 yrs, up to about 12 yrs)
Personally, I prefer to purchase new, unless I O/H a component myself - I avoid rebuilt parts
when possible.Some general thoughts on how to choose:
A) do some research (like you're doing here) - weigh availability against cost/warranty/quality/consequences of subsequent failure/etc
B) what's the cost of replacing the particular part a second time, should it fail?
C) look at the recon part before you buy, paying close attention to details of workmanship and appearance
D) how does the part affect the safety & usability of the vehicle?
E) who is going to be driving the vehicle?
F) what kind of lifespan do you need from the part?
G) what caused the part to fail?
H) what does your experience tell you (what's your comfort zone with the seller and the part you're buying)?
and so on....
You will likely be fine buying from any seller you mentioned (I've purchased from all of them), just consider the foregoing criteria to help with your decision process. Don't forget to check out the store on this website, too.
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