Transactional replication is considered by MS as a DR solution and is part of the High Availability set of Technet articles. Really there isn't really a one-size-fits-all here in the DR arena. There are pros and cons of each technology. For example, TR doesn't deal with database metadata and permissions - at least not in a straightforward way (sp_addscriptexec) but it does have some advantages over mirroring and log-shipping in that the Standby server can be additionally used for reporting.

Rgds,

Paul Ibison