There are several systems that are considered to be the best for online learning modality. Some of the top systems include:

1. Moodle: Moodle is a widely used open-source learning management system (LMS) that offers a range of features for online learning. It is highly customizable and allows for the creation of interactive courses, assessments, and collaborative activities.

2. Canvas: Canvas is a cloud-based LMS that is known for its user-friendly interface and intuitive design. It offers a variety of tools for online learning, including video conferencing, discussion boards, and assignment management.

3. Blackboard: Blackboard is a popular LMS that provides a comprehensive set of features for online learning. It offers tools for content creation, assessment, communication, and collaboration, making it suitable for both synchronous and asynchronous learning.

4. Google Classroom: Google Classroom is a free LMS that integrates seamlessly with other Google tools, such as Google Drive and Google Docs. It allows for easy assignment creation, grading, and communication between teachers and students.

5. Schoology: Schoology is an LMS that focuses on collaboration and communication. It offers features such as discussion boards, messaging, and group projects, making it ideal for fostering a sense of community in online learning environments.

Ultimately, the best system for online learning modality will depend on the specific needs and preferences of the institution or individual using it. It is important to consider factors such as ease of use, scalability, and integration with other tools when selecting a system.