choosing between Linux flavour

We are planning to host  Healthcare application  with around 1000 concurrent  users.

Vendor has given the option either go for  RHEL 7  - 64 bit  or UBINTU 12.04   & Mysql5.5 GPL Ver 2

which one is better.

Also  does mysql 5.5 GPL Ver 2 comes as package with above linux server?  or do i have to buy separate licence from oracle.

Sorry, so for i have been working in windows environment and Linux is new to me.
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The guts of both are similar, the choice deals with which is more convenient/comfortable for you.

Depending on what is available to you, note ref hat 7 is commercial while centos 7 is the freer alternative.

Install both and try them out. Ubuntu is GUI based from the get go. Red hat ....
Usually when one runs a server, to maximize available resources one does not include GUI.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Linux is free of license costs.  POTENTIALLY.  The license demands that the source code be made publicly available.  So if you have the time/skill you can compile ANY Linux distro - even the paid ones - and then it costs you nothing.

RHEL is a paid version (Technically, you can download it for free, but the download, as I understand is code that needs to be compiled - no easy feat so while it's technically free, consider RHEL NOT free).  Red Hat is generally known for good support as I've heard.  Ubuntu 12.04 is an LTS release (Long Term Servicing) meaning they support it for a fee (as opposed to non LTS versions).  LTS support for 12.04.5 expires in April 2017 - that's just a year an a half away.  Be aware of that.  NOT SURE about RHEL support.

MySQL is licensed under GPL - which means it's also free.  BUT in both MySQL and Linux cases, you're hosting a healthcare application with patient information, in my opinion, you NEED, ABSOLUTELY NEED Support on both, so while they're free, your annual support contract may cost more than a Windows license - so they aren't free (but they are what you're told you need).

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madunix (Fadi SODAH)Chief Information Security Officer Commented:
Regarding Red hat (RH); Be informed that  RH maintain different packages in their repositories which have relevant bug fixes and security enhancements created by the upstream maintainers; so they support all the packages available through RHN and DO NOT support, third party packages, custom/modified packages.
Ubuntu LTS only means Long Time Support, it doesn't mean that it gets securtiy upfates and bugfixes for 4 years. It doesn't have anything costs. The other Ubuntu versions come out about every half year, but you can only get updates for a little longer than that.

So for a production environment you should always get LTS versions. The next LTS version of Ubuntu is scheduled for next April as far as I know. With Ubuntu it is very easy to upgrade from one version to the next, so even if the current LTS version expires in April, you can easily upgrade to the next version,

MySQL is included in either distro's although I don't know which versions. Just try it out. For RedHat you can use alternatives, for example CentOS, which is a free, recompiled version of RedHat, or RedHat Clone. It works the same  way so you can use that instead.
For healthcare, you probably want (or may be required) to get an annual RHEL subscription or Ubuntu Advantage subscription to cover your support requirements.  RHEL needs a subscription to access their yum repositories.  Ubuntu doesn't need a subscription to install and upgrade packages with apt, but since you're doing healthcare, you may be required to subscribe to Ubuntu Advantage.

Both Redhat and Ubuntu are linux, but they have different package managers and different default GUI environments,  It's all about which you're more comfortable with and which subscription you prefer.  Both can be configured to run exactly the same.  Both can be configured to run headless, without the GUI.  Both can have exactly the same server services, including MySQL 5.5.
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