Doing a Google search for both materials it appears it's a bit like the wild west with regards to bonding these materials to themselves or others. It seems there is no "welding" option that dissolves and bonds the materials, like styrene and ABS, together. I have built some rolling stock and locos that incorporate PLA 3D printed parts, both major and minor. None of those parts were bonded to others of the same material. Typically the PLA was bonded to MDF or Acrylic. So, the choice was down to how strong a structural bond I needed, resisting knocks and bashes, and how much physical surface area was available to create a "contact patch" between materials.
For small parts with minimal contact patches, or with "pins" to fit in, I used a a good quality medium - thick CA adhesive. Those with larger contact patches I have used PVA. Both have been where bonding to MDF. Where bonding larger items to acrylic, like large air reciever tanks on a loco, I will "drill and pin" the object to the acrylic part using CA again to secure the metal pins. I avoid epoxies as they degrade over time and, unless designed for it, do not like damp environments.
It would be nice if there were a definitive "table" to work from, I suppose that will come with time. As Jimmy says it's really down to a case by case basis. That and the multiplication of materials now being used for 3D printing. Look at what the traditional "go to's" are for bonding disparate materials and what you are going to do with the final assembly. Max
