Mini DisplayPort to HDMI

i am looking at getting a Mini DisplayPort  to hdmi converter cable/adapter.   i have a few questions.  Are they all the same?  What are the differences?  Is the a one size fits all?
rjefAsked:
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rjefAuthor Commented:
Vtin® Gold Plated Mini DisplayPort to HDMI (Thunderbolt Port Compatible) Male to Female Adapter in Aluminum Alloy Shell


VicTsing High Resolution 4Kx2K Mini Displayport DP to HDMI Adapter For Apple MacBook Pro Air iMAC


So what what is the difference between the 2 above?  (from your second link)
rjefAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for rjef's comment #a40904295

for the following reason:

thanks
rjefAuthor Commented:
thanks
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