| S No. | DTM | GTM |
| 1. | Tags or scripts are served asynchronously and synchronously both | All the tags are served asynchronously only |
| 2. | Complete integrations with Google Analytics, Adobe SiteCatalyst, and Adobe Test & Target is provided | No support for tools like A/B testing, surveys, personalization, product recommendations, or tags that require multiple snippets in different locations of the page. |
| 3. | DTM allows to capture variable from anywhere of the page | Each variable is stored manually and available for the same page and can’t be captured from other pages |
| 4. | It is not completely free available | It is available free of cost, anyone can start using it |
| 5. | It is not easy to use, training is must | Slight study can make you use GTM |
| 6. | DTM and Adwords synchronization is not that great | GTM and Adwords synchronization is awesome |
| 7. | Testing is complex | Testing is very easy |