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If you are using 1 1/4 ep's mainly then there is no point on getting a 2" kit.
the two that you have shown are virtually identical.
the first one will be slightly better due to the design.
at the end of the day these devices will get you close but not 100%.
For somebody who is new get a combination of tools.
a laser collimator (make sure it is well collimated itself search the forums)
a cheshire collimator.
Its a redundancy system as they correct for the same type of error but the laser assists in the alignment of the secondary mirror to the center of the primary.
hope that helps
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