Office 2007 migration to 2013 or office 365

I'm interested to get some feedback from admins / engineers on their migration path experiences. I'm running 2007 exchange on private cloud at present. I am considering 2013 exchange in azure but have since found out there are issues with load balancing so it looks like on prem in my private cloud is the only way to go. Office 365 is another option but throws up major issues with performance for terminal services and Citrix. I'm aware of companies that have moved from office 365 back to on prem as the experience was bad. The hybrid model also throws up issues with sharing calendar, shared mailboxes and O365 users sending via cloud smtp with local mailboxes using the on prem smtp.

I'm only referring to larger networks 500 user plus. Thanks
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Vasil Michev (MVP)Commented:
Performance will always be better with on-prem solution, especially when you want/need to use Online mode. If this is the most important point for you, perhaps you should avoid any (public) cloud/hosted solution. Their biggest benefit is usually cost anyway.

That being said, the official recommendation for the O365/Citrix scenario can be found here:

As you can see from the document, Cached mode is the preferred option, and with Outlook 2013 you can easily control the size in terms on the 'cache slider'. In Outlook 2016 you will have even more granular control, so it can have very small impact. In any case, you will need to find the proper balance between network and IO performance, for your specific configuration.
After the comparison between Exchange 2013 and Office 365, I prefer Exchange 2013 (on-prem) over Office 365. Of-course moving to cloud is a better idea, but for managing huge user base (with high performance) Exchange 2013 overtake Office 365. Here is the comparison

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