Do you mean the e-ring’s prongs or something jut out? When you wear the band, does the band rub against this jutting part?
How wide are they together?
I do find wearing, say for example, 3x2mm bands to feel drastically different than wearing one “solid” 6mm band, so upsizing is probably necessary. When your bands are separate they will flex a bit more around as your finger moves and swells, but if solid, they can’t, and will compress more of your finger (like the pudgier part) as well as be more resistant over the knuckle.
It really is personal choice. But they WILL wear in time without soldering. The degree will vary depending on the settings, metals, how close the rings sit next to each other, and so on but it will happen. Metal against any metal will cause scratching, and diamonds against any metal will often cause deeper gouges. I have seen some pictures on PS etc of platinum erings that have been chewed up on the side by, say, a shared prong wedding band. And while you can polish platinum, there is not much you can do for the deep scratches and gouges like that.
Here is an image from tyty333 on PS, showing her platinum e-ring after two years of wear against a shared prong diamond band. You can see where the prongs have been scratched and dented in:
This is D&T’s ring, which is metal against metal – her 14k channel set band against 14k engagement ring, after about 5 years. As you can see, there is a bit of a curve in where the band has rubbed against the ering over the years:
Some people don’t worry about it because they also have no problem changing their settings in a few years if need be, which can be decades depending on thickness of setting and wear. I felt this way with my old rings though they were very smooth/flush and the band did not hit the prongs, etc. My current rings though I want to have forever, so, I do think more about long term wear. Sure over time the gold will wear anyway, but I am not going to make it worse and certainly am going to limit the wear from the sides as best I can!
For me, though, the thing that got me to TRY it is…soldering is not permanent. I decided that if I tried it, and did not like it, I could have them take them back apart. Again, just go to a GOOD bench who knows what they are doing, uses the proper solder for your rings, and there should be NO damage as a result of soldering.
Now that I am on my work computer, I can show my solder in my rings.
Here is the solder from the back. Mine are a bit unusual as they do not join up as evenly so it was a bit trickier:
Here is the solder from the interior (sorry, it is very blurry!):