sys.dm_tran_database_transactions vs. dbcc opentran.

Greetings. I've been using sys.dm_tran_database_transactions to detect which queries are making my TLogs grow, but wouldn't it also stand to reason that dbcc openTran would be an equally effective (if not more so) way of accomplishing this?

Also, I know that sys.dm_tran_database_transactions has some limitations (TLog backups, etc.) but it still seems pretty effective.

Thanks!

TIA, ChrisRDBA