My favourite deck in my collection is the Tarot de Marsella Robledo 2016 edition. It ticks all the boxes for me, ie, it's a TdM, it's beautiful to behold, the cardstock is excellent, and it's a comfortable size. For all of these reasons I use it often, and love it to bits.
The other one I use most often is the Flornoy Noblet TdM, another favourite but not as pretty.
Do you mean right at this moment, or for all time? For me the all-time title holder is the Thoth, but I don't use it for my paying clients unless they specifically ask for it. I've been using the RWS Centennial for public readings and it goes over well. I also bring the Golden Universal and the Gilded in case I don't have time to randomize the Centennial between readings, and they play well with my sitters too.