There really isn't a definitive One True Format, or One Format To Rule Them All. Even the sample rate/bit depth isn't much of a factor. Mastering differences account for the vast majority of any audible differences between lossless digital formats. Anything CD quality or better will convey the artist's intent more or less flawlessly within the limits of human detection. The delivery method or container type just doesn't matter much, or at all really. A WAV file, a CD, a lossless hi-res file, or a FLAC of the same material from the same master will sound the same to you if played over competently designed equipment. Your room and especially your speakers will affect your music far more than any trivial differences in format, or even product differences in your receiver, prepro, or transport. The signal chain from source to just before the amp is, for practical purposes, flawless, even for budget equipment. You pay for better speakers, better amps, the number of amps, room correction, network features, etc., but the basic signal chain is just about as good as it's going to get, regardless of price. So don't worry about it, and enjoy!
