I’ve made lots of these so you don’t have to, and I’ve also braved the new WordPress editor, which is actually worse than Jive, so I’m typing this in raw HTML, because that’s less painful.
Anyway, the spritz allegedly has its origins in an Italy where German mercenaries were common, and who weren’t used to the strength of the local booze, hence the need for soda. The ‘official’ Aperol Spritz recipe dictates three measures of prosecco, two measures of Aperol, together with one measure of soda. I quite like Aperol and soda (50mL to 150mL respectively) but in this context it’s just soapy and a bit awful. Dialling down the Aperol and eliminating the soda (what’s the point?) leaves me with 25mL Aperol and 125mL prosecco, which is quite nice. Your nice might not be my nice, so you might like to experiment, although for my money, the Negroni Sbagliato is more fun.