What differences exists amongst the different hierarchy of gear shifters?

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Never tried Campag so not able to comment.

But I run SRAM X9 on my MTB and it has been faultless since day one.

Tried SRAM APEX on a bike I was using while in Italy a little while back. Again shifting was very precise and smooth, but it took a while to get used to the actual shifters.

Both my roadies run Shimano Ultegra, again with both bikes gear changing is very precise, smooth and fast.
 
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