Zardnaar
Legend
I like twin because of the possibility of double concentration. Quicken is equally good mostly. I think the Goliath damage reduction makes you quite beefy. The other options are equally good though. There is not a lot to argue about divine weapon, but then you should have twin spell because you need that bonus action for the spiritual weapon activation.
AC 15 is plenty combined with the shield spell and the reaction. At level 1, 1d12+3 extra hp is nothing to sneeze at and you need to get to level 3 first to get divine weapon. There are also different level 2 spells I´d rather have than spiritual weapon. In my experience it has often not really paid off. The spell I am thinking of is shadow blade, which you should easily be able to keep up. With that in mind, maybe 17 Strength suffices, because you don´t have to get weapon master. But I don´t know what feat to get then. Probably Tasha´s guide will have a good one.
We are gonna have 2 others using green flame blade. Ones a bladesinger the others an arcane clerics using shillelagh.