My take on both modes of Fortnite:
Save the World: a neat idea. But got repetitive really fast. I can't put my finger on exactly what it is, but it just hasn't kept my interest the same way other tower defense games have
Battle Royale (compared to PUBG): Definitely less buggy and better network connectivity.
Much faster paced, almost arcade-y, compared to PUBG.
The building aspect is really neat and adds a lot of play possibilities to the game.
But my biggest turnoff to this game is traps; I really don't feel they have a place in this game. I've had moments where I'm the last man alive in a squad and I fend off another full squad holed up in a house, just to get killed by a trap they placed outside my room. It really kills the vibe for me.