All shasters are dear to Guru Sahib but Shasters of Sarbloh are really helpful. It's best to keep Sarblohi Kirpan when doing Bhagti. Guru Sahib has given Hukam that Gursikhs should be Shasterdhari when coming in Hazoori; so when doing Bhagti, we should be prepared for Darshan of Guru Sahib jee, and thus should be fully Shasterdhaari Kharakdhaari at that time.
Rest Guru Sahib knows better.
Kulbir Singh