Shiva Purana
शिवनाम्नो जपादेव तस्मात्कोटि गुणोत्तरम् ॥ श्रीदेवीनामजापात्तु ततः कोटिगुणोत्तरम् ॥ २९॥
By chanting the name of Lord Shiva it is a million times better than that. By chanting the names of Śrīdevī, one is more than a million times better than that.
english translation
zivanAmno japAdeva tasmAtkoTi guNottaram ॥ zrIdevInAmajApAttu tataH koTiguNottaram ॥ 29॥
hk transliteration by Sanscript