The majority of web browsers are offered as 32-bit and 64-bit version nowadays, and it is up to the user to decide which version to run on the computer.
This comparison guide analyzes the performance of select browsers to find out which version of it performs better.
You can use it to compare the 32-bit and 64-bit version of a browser, or compare the performance across browsers to find out which may be most suitable for you.
It won't take other differences such as plug-in support into account though so keep that in mind. These differences can be important depending on what you are using the browser for. If you require certain plug-ins for instance such as Java, you may not be able to use a 64-bit version of a browser as it may not be supported.
Performance is not everything of course and there may be other reasons why you pick a particular browser over another even if it may use more RAM or perform worse in benchmarks.
The test system is a decent Intel Core i5-2500, 8GB RAM, 256 GB Solid State Drive system with a Nvidia GeForce GTX 960 and Windows 10.
