I have never used Floid Blue. I have and use both Epsilon Mediterranean Blue and Myrsol Blue after shaves. Let me first say YMMV. I enjoy both Epsilon and Myrsol. To me they are fresh, citrusy, light menthol, and smell like all the good things I remember from Spring/Summers gone by. Light aquatic too. Similar to Aqua Velva blue too.
The way I landed on Myrsol was a Q Brothers video. They're related to Smallflower/Merz Apothecary and pretty hilarious during the video. Their assessments influenced me to buy several of the Myrsol splashes; the ones I still have and use and will re-buy are Myrsol Blue and Myrsol Agua de Limon.
So, back to the blues. The ones I use currently, enjoy, and will re-purchase are Epsilon and Myrsol blue. Hope that helps!!