Why Is Fidelity So Great?

Hi There! I’ve recently rediscovered Reddit and am a big fan of Jack Bogle and Vanguard. I’m in my 50’s, have several accounts in multiple financial entities and am on the glide path to an “early” retirement. I have never used Fidelity ever. I’m Bogelhead in that I invest in passive index funds and really look at expense ratios and fees. I DIY my investments/retirement planning. What is so GREAT about Fidelity? I mean, is an app difference enough justified to be there? I’ve heard so many people curse Vanguard and love on Fidelity but I don’t understand why. You Tubers like Rob Berger and Joe Kuhn just SING the praises of Fidelity…..I’m comfortable where I’m invested, and eventually intend on just everything being in one place for ease of maintenance. Why should I love Fidelity and move all my stuff there?