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Hi Giorgio and welcome. I have a pair of Celestron 15x70s and I have a great time with them. I find them at their best for open clusters and these can be quite stunning in binoculars. Many are better in binos than telescopes. For most nebulae and all galaxies, you will need a telescope. Well there are a few galaxies you will see but not with detail. Even when you get a telescope you will still get a lot from binos not just for finding things, but they offer a unique perspective with no set up time.
I haven't used the others that you've mentioned so I can't help with comparisons. A tripod will be good with 15x70s but I can get away with hand held up to a point.
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