@nehachopra There can only be one answer:
You should really choose Solace PubSub+! 
It’s the best with regards to performance, scalability, robustness and flexibility.
And it’s the only one that gives you the benefits of a super dynamic Event Mesh!
With regards to future growth of your company, I believe being able to easily scale out the service to support increased load, be able to deploy and extend to any Cloud (and on-prem), having built-in HA and DR or some other factors that you should cater in.
p.s. I’m expressing my honest opinion, but I may be a little bit biased as a Solace employee.
p.p.s. If you have any specific requirements or are looking for a more indepth comparison, you may want to discuss this with one of our account teams.