Which is the Best GPS? Garmin or Tom Tom or Magellan?

I am looking to upgrade my Garmin Nuvi 260w soon to either a Garmin 3790LMT, Tom Tom GO 2525M LIVE, or Magellan 5120LMTX. If anyone has experience of any/all of these units I'd appreciate your observations/"real world" experiences using them. Pros & Cons of all would be very useful too in assisting me in my final decision. Serious answers please! Thanks!