People argue about splits like there is one correct answer. There is not. Full body and split routines both work. The better choice depends on your schedule, recovery, and preference.
Full body is excellent when you train two to four days per week. You hit each muscle more often, which helps with skill practice and steady progress. It is also very practical when life is busy.
Split routines shine when you have more training days and want more volume per muscle group in a single session. Upper/lower is a great middle ground. Push/pull/legs can work well if you can actually commit to enough weekly sessions.
A good rule: if you frequently miss sessions, full body is often safer. Missing one day on a body-part split can mean a muscle group gets skipped for a full week.
Choose the format that lets you keep effort high without frying yourself. Then stay consistent long enough to evaluate results. Constantly switching because of social media trends is usually a progress killer.
Both options build muscle and strength. Execution matters more than the split name.