Hi. GLP-1 is an injection typically aimed at T2s who are a lot overweight. There are various branded versions such as Liraglutide. Insulin is aimed at anyone who can't control blood sugar through tablets and sensible carb intake. GLP-1 drugs do have some side effects so Google the web to find out more. Insulin effectively has no side effects but doesn't help weight reduction as GLP1s do. If you are overweight then are you low-carbing? This is virtually the only way to get weight and blood sugar down at least to some extent and possibly avoid a GLP-1. Are you already on some tablets including Metformin? Note that taking insulin if greatly overweight can result in high doses and blood sugar swings so the right diet is also important with it