Thanks all. Looks like the ROS is sold out.
The Labua looks interesting, especially the tower club. Those high floor river view suites with balcony definitely seem like they would offer the best view.
Is it a good hotel though? Reviews seem quite mixed…
I hear Lebua is very over-rated, to be honest. One thing you could consider which, granted, is a bit further away but still on the river so should have good views too: Four Seasons or Capella. There are not really any high-rises blocking the view from there, if I remember correctly, so could be an option - I am not 100% certain though.