There's a lot of it I love. The opening sequence is magic, Billy Crudup & Carmen Ejogo & Amy Seimetz are all amazing, the score is unsettling, the Engineer bombing sequence is amazing, the David & Walter fight is awesome, the backburster sequence is great stuff(but not as strong as Kane's bursting or Shaw's C-section), the solar sail repair sequence is marvelous, all of the shots of the Covenant gliding through space are breathtaking.
Never has an ALIEN Alien film been so big and breathtaking(Prometheus I don't include because it's so radically different)... maybe the AvP flashback, or the Betty docking on the Auriga in Resurrection, or that wide Ripley 8 jump as she frantically ran.