Default [Q] Media Player Sync (Chromecast, Plex, MX, etc)

Here is my issue. I travel a decent amount for work and also watch movies/TV shows while at the gym. I basically want one central point that allows me to pick up where I left off weather it is my tablet/home TV or hotel TV. Currently I just use my tablet as my central point.

Downlod content to PC. Transfer to Tablet. Watch on Tablet. Conect via HDMI out to TV or use Chromecast.

A couple problems.

- I use MX Player on my tablet, but does not allow for chromecast. Is there a better media player that will allow for chromecast, but also be a very good media player and organizer?

- I have plex set up on my home laptop, but honestly have not used a whole lot as it does not serve me once I am out of the house. Does Plex Pass solve this issue? If so is this a better solution than storing everything tablet and using that as my central point?

Any input would be great as I am open to whatever works the best.