First time joining a knitted jumper together

[longtompot]

This is the first knitted jumper I've made and I'm a bit unsure how to join it at the shoulders. The top has a bit of a detail to it, seed stitch I think, and all the videos I've seen are for joining and standard knit a row purl a row pattern, stockinette stitch, which the rest of the body is made from.
Can anyone point to where they would stitch to join from the attached photos? I'm leaning to sewing through the stitch closest to the jumper on the top row, but just wanted to hear from more experienced knitters before I started

With the right sides together I would stitch along the yellow dotted line with quite a loose back stitch.

@TonTonMacoute ooh, ok, quite far away from the edge then. Maybe instead of back stitch I could do mattress stitch? I'll give it a go and see what it looks like. Thank you

Sorry but I wouldn't, I would sew through the loop of the top stitch on one side then over to the other side (right sides together) as this creates a flat seam that sits on your shoulder more comfortably.

Not if you do it properly. I have always done my shoulder seams this way, it's easier to match the pattern, if there is one, it's a much stronger join which won't stretch, and if you block the pieces properly it is quite flat enough.

Thank you both. I tried both of your suggestions and the flattest one does seem to be the one @Mossstitch suggested, but it might be that I'm not doing it properly as I've not done this before @TonTonMacoute