Abilities generally matter much more than stats using your example Ficaria 2 abilities are mehish. Hp heal on pest nodes is only really useful on specific levels(like 12-5) and very little use on most other levels. WHile the -5% atack miss could be good with a specific dodge heavy team with other debuffs.

Sarcanda +10% attack for all squad members is really good(with a full squad of knights with 6k plus attack thats like a +3k att bonus in total) and medium dodge can gives a lot more survivability.

I fell you should use gems to upgrade storage intill you feel you have enough than use the rest for 10+1 gatchas. While they say the drop rate is only .5% its actually seems MUCH higher recently. I think i have rolled rainbows in 6 of my last 7 10+1 pulls along with about 25 golds.