Hi Jinty,
Both are 'classic' 7x42's, and much loved and discussed both here and elsewhere. As to which is 'better' . . .
For a superior starting point, see Roger Vine’s review of each at:
Binocular Reviews
(Roger has also reviewed the Dialyt’s successor the Victory FL - another much loved and discussed classic 7x42).
One point to note is that their introductions and design considerations are separated by 22+ years:
the Dialyt was introduced in 1981, though all but the eyepiece date way back to the 8x56 version of 1968!, and;
the BR precursor of the HD/ HD+ was introduced in 2003.
And there's also the striking difference in length: 190 mm/ 7.5 in verses 141 mm/ 5.6 in
(though there’s not a significant difference in the weight: 800 g/ 28.2 oz verses 770 g/ 27.2 oz).
As I couldn’t find an image to illustrate the point, I've created a quick composite to give an idea of the difference
(with the Zeiss image from Arek’s Allbinos site).
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I’ve also attached a copy of the specifications for each.
For those interested in the details of the Leica’s optics, see post #19 at: https://www.birdforum.net/threads/what’s-your-favorite-7x42-binoculars.379534/
And for the Zeiss see:
Zeiss Dialyt 6x42B - Binoculars - Cloudy Nights
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Finally of more general interest, while looking for UV images I came across one I’d not seen before, comparing the 8x42 UV HD+ to it’s Noctivid counterpart.
It’s from:
Leica Binoculars: The Ultimate Buying Guide | Red Dot Forum
John