Tried the sonos and was impressed by it but both seem a tad pricey for what they are. Do you use iTunes? If so consider an apple TV connected to an amp or TV of your choice. If you loathe itunes go for the sonos, haven’t tried any recent products from bose but have always thought their products were overrated in terms of sound quality.
As far as I know music will never garble over wifi as I assume it’s temporarily cached in the device, so it will either play or not play.