Hello Shraddha,
If you use both to inventory the same machine, you have a potential issue of overwriting the records for either method since there can only be one record existing for each machine within the SCCM console. This is the only issue at this time that I am aware of that could happen. However, most users don't use both in their enviornment, with that being said I don't know of all the other potential issues that could arise from using both. I would recommend trying both methods (one at a time) and seeing which one does best for you.
Thanks,
Jeremy Thompson
Dell Support