There’s no “better” platform for running webMethods software, without knowing more about your environment. Factors include how comfortable your IT staff is with the different platforms (i.e., if they run lots of Solaris boxes, then a Red Hat box is going to be hard to manage efficiently - or vice versa), as well as cost, performance, etc.
From a purely performance perspective, Intel/AMD hardware is much faster for the money, assuming you’re CPU limited. The operating system is a relatively minor concern. So if you’re trying to get maximum performance, I’d suggest either Solaris or Linux on an Intel/AMD box (the Sun AMD Opteron boxes are very nice).
If you’re not CPU limited (Broker would be an example), then the disk subsystem matters more than the CPU type, speed, or operating system.
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