I am not always using healer in Raids, hence I would rather use Jade than Garnet when attacking. In harder map or quest I would use both.
Ps. the only 5* healer that I fully developed is Garnet and Rafael. My other 5* healer are at 3.70
As mentioned, manipulating mana is important part of my gaming style just to change the situation or get a new chance. I wouldn’t let Jade be in defense team but Garnet.
Mica is also a mana manipulative hero, but instead increasing… I think it is a matter of taste if increase “your mana” is better or “decrease enemy mana”. Obviously SG think enemy decrease is slightly better, hence lower level at Jade? (I think it is lower % compare to Mica , I am not sure)
At difficult quest I prefer enemy mana decrease, Jade decrease every enemy.
At Raid I would rather having Mica.
I would be happy to get the last Ninja, but I know that statically the chance is smallest to get the last specific one.