This is a great question and also has a compelling gender angle.

One thing you will often find throughout grave sites in Scandinavia is a comparative lack of female remains. The reason for this appears to be the longstanding practice of "selective female infanticide" which has been recorded in Old Icelandic family sagas. Nancy Wicker has done a fair amount of work on this and has argued that with the Christianization of Scandinavian communities came a change in the rates of female infanticide and consequently an increase in the number of female graves seen in later Viking settlements. Nancy Wicker, "Christianization, Female Infanticide, and the Abundance of Female Burials at Viking Age Birka in Sweden" Journal of the History of Sexuality, 05/2012, Volume 21, Issue 2.

In her examination of Birka, a Swedish trading site, she found a number of different burial types including "cremations, inhumations with and without coffins, and chambered barrow inhumations; externally, some graves were flat, whereas others were marked with mounds and stone settings." (247) She found that while Vikings were known to practice both cremation and burial roughly half the graves from this site consisted of cremated remains indicating a persistent preference even after Christianization.

While Vikings of both sexes were often buried with precious goods to honour the deceased and be used in the hereafter it remains very difficult to sex individual graves with certainty given the fluidity with which certain items are found. Female graves for example have been known to contain weapons which has in the past led to mistaken identification. Janet Henderson, “Pagan Saxon Cemeteries: A Study of the Problems of Sexing by Grave Goods and Bones,” in Burial Archaeology: Current Methods and Developments, ed. Charlotte A. Roberts, Frances Lee, and John Bintliff (Oxford: British Archaeological Reports, 1989), 77–83.

Nancy Wicker has nonetheless argued that there are some general trends in gendered burial practices with certain goods being disproportionately found with certain sexed remains. " Specifically, swords, spears, axes, riding equipment, blacksmith’s tools, and penannular brooches were associated with males, while paired oval brooches, trefoil buckles, disc brooches, arm rings, necklaces, jewel boxes, and spindle whorls were discovered with females." (Wicker, 249).

With Christianization came a change in the emphasis upon grave goods. Thomas DuBois's monograph on Norse religion during this period indicates that clergy intentionally nurtured a more humble approach towards burial, with men being buried in a simple shroud in a rectangular or oval shaped grave facing towards the East. In some cases stones were arranged around the grave in the shape of a boat. He perceives this as being an intentional break made by Catholic clergy in order to reject previous conceptions of the Viking afterlife where such goods would play an important post-life function. Thomas DuBois, Nordic Religions in the Viking Age (Philadelphia: University of Pennsylvania Press), 73.

As for Viking ship burials, which are naturally the most famous thanks to films and so forth, these could take a number of forms with the "deceased and/or ship being cremated, cremated and buried, or simply buried." (Dubois, 71). However due to the cost of such burials they were certainly the exception and restricted to a wealthy elite who merited such an honour.