There are many discussions already in the internet about this topic.
I will just want to share my experience here.
Those came up with the following topics ...
Security
I will start this with a comparison:
In the time when I used Windows and MS Office I had much more security problems.
Today I'm using Linux, LibreOffice and Thunderbird.
Support
If you are a fan of SLAs and contracts I have bad experience for your.
It often seems that the bigger the provider, the more worthless it is.
If you focus more on getting help than on staying legally safe, a community is often better source of support.
Further more, companies have a limited amount of staff that can handle problems.
The internet community is full of people who want to help.
Costs
For both you need to spend effort (time=money).
The questions are:
Are the features in the paid version worth the money?
What are the expected costs for:
Product
Integration
Education
Maintenance
Future proof
If a company disappears from the market, it's products also do
Open source projects are usually maintained by lots of developers
I want to keep up with new technology
Maybe I want or need to replace only a single part with another
As I did with GNU make, what I have replace by OBI (Object Builder for i)
Integration
In a DevOps circle, you want to connect as many parts as possible.
E.g.: JIRA --> git --> build --> UnitTests --> deployment --> monitoring
Proprietary products can connect to other systems, but they are limited.
You depend on the company's strategy for new technologies.
There are many discussions already in the internet about this topic. I will just want to share my experience here. Those came up with the following topics ...
Security
I will start this with a comparison: In the time when I used Windows and MS Office I had much more security problems. Today I'm using Linux, LibreOffice and Thunderbird.
Support
If you are a fan of SLAs and contracts I have bad experience for your. It often seems that the bigger the provider, the more worthless it is.
If you focus more on getting help than on staying legally safe, a community is often better source of support.
Further more, companies have a limited amount of staff that can handle problems. The internet community is full of people who want to help.
Costs
For both you need to spend effort (time=money). The questions are:
Future proof
Integration
In a DevOps circle, you want to connect as many parts as possible. E.g.: JIRA --> git --> build --> UnitTests --> deployment --> monitoring
Proprietary products can connect to other systems, but they are limited. You depend on the company's strategy for new technologies.