Personal preferences aside, it depends on what size vehicle you want. The RDX is a small CUV. Highlander can hold more people and is larger. The RDX size compares more to the Toyota RAV4. I had three RAV4s and am on my second RDX. I feel I traded up. :-)
A: Toyota Sienna Acura MDX Acura RDX
Acura RDX was created in 2006.
Recreational Dimensions eXperiment. Acura RDX
The 2013 Acura RDX has 24 valves.
The 2011 Acura RDX has 16 valves.
The 2009 Acura RDX has 16 valves.
The 2007 Acura RDX has 16 valves.
The 2014 Acura RDX has 24 valves.
The 2013 Acura RDX has a V6 engine.
The 2010 Acura RDX has 16 valves.
The 2008 Acura RDX has 16 valves.
The 2014 Acura RDX has a V6 engine.