Am I assembling sweaters the right way?

I have been putting my sweaters together by putting right sides together and using a running back stitch. is this wrong? I work full time and can’t get to a local yarn shop during the week–weekends are usually on the road visiting family members or out in the yard. I learned to knit many years ago, but I had friend who had the shop in Alabama and she would put them together for me. :knitting:

Most people use mattress stitch to seam sweaters.

There’s a video here under finishing techniques.

Some still photos here -…attress_Stitch

Thanks I will definitely check out the mattress stitch…have 3 sweaters ready to assemble and was holding off until I got some advice. J.