I changed over from Exante to S&S. I couldn't stomach Exante in the end, didn't like anything but their porridge! S&S is a million times better, there are a couple of things I don't like but because of the massive variety there's still plenty of others to try. Here's my thoughts/comparisons.
Porridge: Exante is nicer than S&S in my opinion.
Shakes: S&S are far nicer, taste more like what they're meant to. Exante shakes tasted quite artificial to me.
Meals: Obviously Exante don't do the meals and to be honest, they were the major selling point of S&S for me. They taste nice but it's that feeling of actually eating a meal that has made a real difference for me.
Soups: Don't like the soups full stop!
Bars: Exante bars were horrible, tasted artificial, too like rice krispy bar type things and tasted/felt powdery. S&S bars are nice, got to find what you like though. I'm not keen on the coconut one, feels oily. The truffa and praline bars feel like a real treat though. Love the lemon bar and the maple one, oh my god, to die for!
Personally, I'd rate Exante about 2/10 and S&S about 8/10 so I'd definitely recommend giving S&S a try! They do a week's sample at a lower price if you want to give them a try.