I think that peptides are kind of like weak AAS runs over a length of time. Also depends on which peptides you are referring to. You have all of the ones already mentioned then you have IGF-1 LR3, DES 1'3, PEG MGF that are even more anabolic.
If you have joint problems any of the GH releasing IGF peptides will help. They will also help keep weight on during a cycle. Peptides tend to increase testosterone production or at at least testicular volume. Typically you will not lose whatever you gain. With the IGF stuff most of the gains you get from that show up in the 6-8 months following the run when the new muscle fibers begin to mature and grow. So that makes it a little hard to say just what someone will get out of any GH or IGF peptide.
What you can depend on is increased recovery, increased insulin sensitivity, increased fat burning, increased protein synthesis, increased cell reproduction, and increase cellular repair. Does it amount to add in Turn into a stack, not as far as gains but it may break you even on gains verses weight lost, while making you healthier in general.