Within the next couple of days, I'm going to need two Linux VPS instances (probably Ubuntu 10.04), one running PHP and one for Ruby on Rails. Both are most likely going to use nginx and MySQL and have about 256-512MB RAM.
Now the question is, should I go with a 32bit or 64bit system? There is a related question already posted, but without any specific information on how to decide.
How does 32bit vs 64bit system behave from your experience in these conditions? (Ruby/PHP, nginx, MySQL)