As per our experience since last 5 years we can suggest digital ocean: https://www.digitalocean.com

Also you can try odoo.sh: https://www.odoo.sh

Digital ocean is quite good and cheaper than AWS.

You've certainly read the Performance Tips & Tricks slideshares of Olivier Dony talk. It contains samples and rules for a good hosting architectures. But in case :

• the slides https://www.odoo.com/fr_FR/slides/slide/performance-tips-tricks-399

• and the video https://www.youtube.com/watch?v=A_BWyFeGgVA

As Per my experience, suggest you following hosting solution

 https://www.a2hosting.com

Hosting in Odoo plays a crucial role in improving overall performance in the business operations of the Odoo platform. As @fabien mentioned Odoo.sh is one of the best and primary hosting solutions for you in Odoo. Moreover, there are other hosting service providers such as Rosehosting, SolaDrive, Kualo, Linuxfox, A2, and many more.
You can read the following blog to have an understanding of the entire hosting aspects in Odoo:  https://www.cybrosys.com/blog/odoo-hosting-complete-guide

We provide fully managed Odoo hosting on multiple cloud providers. Our managed hosting includes:

• Odoo installation and setup
• Full infrastructure maintenance
• Backups
• 24/7 Support
• 99.9% Guaranteed uptime
• OS upgrades and patches
• Odoo version updates
  

We manage AWS, Google Cloud, DigitalOcean, Linode, Vultr and Azure.

For large scale deployments, we also deploy Odoo on Kubernetes.

Have a look at:

https://www.shellstack.io/managed-odoo-cloud-hosting/

Thank you!

if you looking for self hosted, think in terms of docker swarm and Kubernetes clusters, so look for implementations that cover proxmox, multipass by ubuntu or any other container solution like openstack or some gigabit vps host

The best is probably Sola Drive. They are an official partner and go an extra step with Odoo support. I wrote a guide for Odoo hosting providers if you want to check it out.

https://host4geeks.com/odoo-hosting

You can take a look at here as well http://bit.ly/3280PfB

If you are starting your own Odoo instance check Vultr - https://www.vultr.com/?ref=8633604-6G

They give the fastest CPU in cloud industry:

• cpu MHz         : 3792.000

• bogomips        : 7584.00

Use the link provided to get 100 USD on your account.

Even though the reply is so late, this may be useful for new joiners. 

You may choose DigitalOcean with Ubuntu 16.04 / 18.04 LTS for better results.

If you wish to have a 100 $ FREE Credit for 60 days during Hacktoberfest, you may use the below referral link, 

https://m.do.co/c/722cdeda20cd

You can try a managed dedicated server/VPS provider like SolaDrive. Or an unmanaged one like Vultr. Both are great options for Odoo.

I am currently using 8 core, 32 GB SAT server.

Only looking for a server with higher specifications. @Dreamy & @Jainesh Sha