Both are good options. Face-to-face classes are good for the understanding of a subject. It’s good for people who need someone to explain the concepts to them once. Also, you will write and make notes in dams class, an added advantage. So definitely it’s a good option.
On the other hand, Marrow is good for people who can’t sit for long hours in coaching. They should then opt for the plan C of marrow which includes videos, watch and write notes from them. It can be time-consuming too. you might put in more hours in one subject as opposed to an average two day class per subject at dams. So manage your time properly.
Another mix option can be to join dams foundation which runs through prefinal and final, take Marrow Q bank during the internship. I see this as the best one.