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20" looks better compared to 19" - but that's a (and my) personal opinion. If you like a sporty stance it's for sure looking better with 20s. The openings are not determined by the size - the height will be exactly the same (I would hope or you're going to have other issues). The width of the combination rim/tyre is determined by a number of factors like the ET-value and rim-width. You can have a 20" that creates a bigger space and stands less flush compared to a 19" wheel (look at the OEM wheels without spacers - ET 44 and 9x20 in the back won't give you a great result).
That being said - I've opted for 19" winter-wheels as in my part of the world 20" winter tyres are rather rare and if you unexpectedly need to replace one there's always the risk they are not available (for sure in the midst of the season or towards the end). For summer-wheels I've opted for 20" too for reasons mentioned above - and 20" summer-tyres are readily available all the time.
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