If you've never seen these then watch Pacific first as it is absolutely crap and you'll be seriously let down if you watch band of brothers first since it's some of the best TV ever made.
Talking generally. :)
There’s no 4K TV shows an iTunes, unless you’re talking more generally
doubt it was filmed in true 4k - so would likely be upscaled.
Pacific was a bit of a damp squib Reminded me of Thin Red Line another over sentimental load of tripe