One or two modular switches?

Messrs,
How can I determine if I use one or two modular switches?
what Is better one modular switch with redundant power, CPU and two module of each model (2 giga modules, 2 fast modules) or two modular switches with one power, one CPU and one module (of each)?
Exist any cisco document that show how to solve this question?
thanks in advance,

I'm sorry but what are you trying to find out? Maybe you can start with show version, this command is understood on both CatOS and IOS. Post it and then ask again what you want to find out. Some switches are stackable, some comes in chassis that comes with different kinds of modules, and some are fixed chassis like the catalsyt 3550 and below. They are fixed as they do not accept modules. 3750's are stackable in which you can stack them using the stackwise cables that let you manage more up to 9 3750 in a single CLI via stack.

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I was not talking about the mgmt0 interface. The vlan that you are testing will have a link blocked between the two 3750 port-channel if the root is on the nexus vPC pair.
Logically your topology is like this:
| |
| Nexus Pair |
3750-1-----------------------3750-2
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http://bradhedlund.com/2010/12/16/routing-over-nexus-7000-vpc-peer-link-yes-and-no/
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