I didn't even notice there was two 103's, only looked at the pics! They stuffed up with the description on the third one that's not a 103 that be the Original dual coil Brunhilde rta Vapefly Brunhilde RTA 25mm 2ml/8ml Rebuildable Tank Atomizer (just for reference!)Forgive my ignorance but the big boy is the top coiler??
They are both 103s and from pic looks like the top is sloped on one, squared on the other.
Yes prefer dl and enjoy dual coil.
This is the one that would suit you the best if you like a dual coil and DL

As for your question on the top coiler all three Brunhilde's are top RTA's as the deck is at the top of tank and juice below so your could is up top nice and close to your face to bang that flavour in!!
If you have any more questions don't hesitate to ask away!