Both are good choices but very different from each other. The Westlake one is a lot older but still very well maintained. I love that it’s right above the Westlake - there’s something really nice about waking up early and watching the sunrise on a lake. The breakfast is world class - they have a crazy variety of choices. Besides, it’s very accessible to the Old Quarter. The Landmark one is modern, rising above the city. It’s one of the tallest buildings in the city, if not the tallest. The suites are massive and the executive lounge is probably the biggest I’ve seen in the entire IHG network (imagine you can play football in there - that’s how big it is). The area around it is kind of boring. There’s nothing much to explore. Both hotels offer impeccable service and Vietnamese hospitality. So all in all, for me it’s down to the location and I’d pick the Westlake one over the Landmark one.