Question : lock page data row vs all pages

We are having some deadlock issues with multiple independent processes executing stored procs. I understand there are many ways to sync them. But my questions is;

are there any disadvantages to use datarow lock over all pages lock for a table. It seems to me with datarow lock almost all of the deadlock issues we had were able to be resolved. So why should I NOT just use datarow lock for all the tables? what advantage is there to use all pages lock? a slight performance gain?  

thanks for your help

Answer : lock page data row vs all pages

datarow locking generally (assuming your rows aren't so wide as to use one row per page) use a lot more locks than allpages.  There is overhead (i.e. decreased performance) simply from managing all those locks, and less memory available for caches if you need to allocate more lock structures.

However, I would encourage you to experiment with various combinations and benchmark your own application.