For online learning vs classroom, define better learning first.
This question should not only compare convenience and interaction. More important factors are learning outcome, feedback speed, self-discipline, and access.
The learning-outcome standard is the comparison skeleton.
Diagnostic evidence
If the conclusion only says both are useful, the comparison standard did not drive the answer.
Pre-draft outline check
Choose a standard first: feedback, discipline, access, or practical skills. Both body paragraphs should compare around the same standard.
What to revise after checking
Rewrite two topic sentences so both include learning outcome, not only the class format.
01
Common trap
One paragraph says online is convenient and another says classroom has teachers, without explaining which improves learning outcomes more.
Whether the standard is learning outcome
Whether feedback and discipline are explained
Whether the conclusion has a preference
Guides
Keep going with these guides.
These pages explain the Banfen Writing diagnostic and blocker-repair method, Task 1 overview, Task 2 development, and common score blockers.