@Nibbles
I do not think that shotguns are good for starting players, they are harder to use, slower, have a smaller distance of dmg and in my opinion, do not forgive at all as to be effective you need to be in real cqb and have a solid aim wich is harder to begin with.
I myself, even if I play a lot, a lot, a lot of BF4, didn’t even begin with aura+shotgun.
I preferred the Blishlok wich is more versatile and I quickly decided to buy Sawbonez without trying him --> it’s a kind of answer to the OP but it’s a yes and no 
To be honest I only begin to appreciate Aura lately by buying a Remburg7 loadout because I wanted to give a try to the shotguns.
Her speed is very nice, I’m more confident in going vs 1-3 players with that shotgun “just to try”. And I said to myself recently “she’s the first medic merc we have in the game, I should have tested her more from the beginning”.
But to be honest I prefer Sawbonez as someone said “he is more similar to medic in other games”, a mobile medic, a little tougher, better weapon.
When playing execution I chose him over Aura cause I believe I can live a little longer and take down some tougher mercs + the ability to be independent thanks to big medpacks is the thing I appreciate the most.
Maybe it’s a BF4 habit. It certainly is.
But, because there’s a but : I do not like Sawbonez speed, I find him slow.
For a medic I would prefer something a little faster to reach downed team mates in less time and that’s where comes Aura’s Force, her ability to pass through the fire lines to revive.
That could not be done with Sawbonez whose slow speed forces him to interact with enemies to pass those lines. After all 110 hp is “just” two more bullets in the body or one in the head compared to Aura, so a bit more speed would be great to force players to use him as a medic of the first line of fire, the one who rush to revive and heal, not the one who is looking for tdm confrontation.
So my answer is : - Aura as first merc, so people can try this class, even if she’s bit weak, wich will force them to stick to the healer role + so they have a good idea of what a fast medic can do in this game.
- Sawbonez as second medic : people by playing some dozens of hours will be more confident in getting on the front lines, and would succeed more playing an aggressive medic.
–> Now : I see many very good Aura’s players out there who have a good station placement that make them almost invincible, they play really aggressive with shotguns and are hard to take down. Put a fatboy beside her like Rhino who will eliminate the threats and she becomes a Voodoo god of healing almost impossible to kill and who reaches and revives all the team mates in the area : a real danger.
“I loved the idea of making an African-American lady one of the first things that people see in our game”
I’m totally okay with that idea, and I loved that diversity in DB, but to be honest, I really disliked Aura and Fletcher’s voices, too much cliché, too much caricatural if I may say; they remind me of the bad ones in Hardline. Sawbonez voice is good, relaxed, a “normal without any exaggerated accent” African-American voice.
Didn’t like Aimée exaggerated accent, too fake, she’s not french
she want us to believe that!
she’s not funny at all. Looooved Bushwaker, Rhino and Nader are funny : DefuuZing Ze C-FO! Stoker so classy …
i would be fine if either one was free and you had to buy the other. i would find it interesting if new players were not given a medic but where given another merc, who that would be i have no clue.