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I personally own an 8 inch dob and anytime I have shown friends or family objects through it, they are blown away.
8 inch is probably the sweet spot for portability versus maximum aperture as well as budget.
However a 6 inch Dob will keep them busy for a long time to come. Most scopes will come with a few eyepieces as standard I believe. But a barlow lens might come in handy for planets.
The EQ mount you listed below will be decent for a beginner. But will have more of a learning curve as it will need to be polar aligned, balance the scope etc. and finding objects in the sky won't be as "intuitive" as the dobsonian due to the way the Equatorial mount moves. But these are all things they will need / want to learn if they decide to continue on in this hobby.
As far as ease of use and best views the dobsonian is going to win hands down. It's literally just a case of plonk the telescope outside, throw an eyepiece in and your viewing.
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