Shredder, I have found by my own 2" and by comments by others on the net doing EP reviews that the biggest difference is better 'Eye Relief'.
If you wear glasses a 2" or a Barlow is much easier for comfortable viewing unless to can shove your glasses right up against the EP which will scratch it!
Plossls of 1.25" however do have a reasonable eye relief until you get to the shorter f/ratios.
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