I've heard knifemakers say that bolterless knives,besides being lighter,obviously,are stronger in the handle,because there is no seam,where the bolster meets the scales.
A traditional pattern slipjoint with "the works" ,different configured bolsers,scales & shield,etc,certainly has it's own appeal.
I like both styles.For the edc "user",most guys will vote bolsterless,but there are many here who edc the "loaded" slipjoints
Comes full circle to personal preference
-Vince