Our partner program has different partner tiers for both development and agency partners: "Solution", "Business" and "Enterprise".
Solution partners are meant for smaller agencies or development companies, implementing smaller projects or supporting bigger projects with their work.
Business partners are meant for mid-size agencies and projects. Rule of thumb: if you can provide up to 5 people working on one single client's project, that's what we'd call "mid-sized".
Enterprise partners are meant for enterprise size projects. Are you able to provide 20+ developers for a project? Have experience in for example integrating SAP or Hybris shops with TYPO3? Can you provide full teams working for years solely for one client? Then enterprise might be the tier for you.
Of course, when you fulfil the requirements, the final decision which tier to use is still yours.