I think what
@7sleeper is trying to say is , do the same mods on both saws in question and then say and prove the smaller cc saw is equal or better then the larger cc one - keeping in mind that they are both supposedly worth a equal amount of money!
Considering I own and use a Dolmar PS-6400 & PS-7900 I can imagine what a Dolmar PS-7310 is capable of - she shouldn't be anything short of awesome.
I have no clue what a Stihl 361 handles like, nor what she is capable off, thus I am inclined to other members opinions and those quite often sound a bit bogus to be honest.
It is a smaller saw, of course it is lighter then the PS-7310 - but claiming the 361 will do or even out cut a PS-7310, I don't think so.
But, what do I know, I own only 4 saws, one of which is not currently operational.
P.S.:
The OP missed telling us the true nature of his question in detail, but to my understanding he was contemplating which saw to let go to finance the PS-7310.
If that is the case, sell Your PS-7300 and replace her with the PS-7310 - but only if the PS-7310 is in better condition then Your PS-7300 and You don't have to ad any or too much money to purchase her.
Then again, maybe I got this wrong as well!