Jenessa is OK....but she died easliy when confronted by Falmer
DB inititate is by the far best IMO.
Others that have been good.....not so good?

!!
Seriously, he's extremely good, very strong in melee and amazing with staves. He'll use a soul-trap bow and/or soul-trap axe and if you keep him supplied with soul gems, you'll have all the recharging material you'll ever need. His health is very high. I kept him in ebony armor. He prefers 1H/Shield and is strong in Block also. What Olina really loved about him is that he NEVER complains. The complaining followers are a real turnoff.
He will use some staves but prefers his Chain Lightning spell so stand back. I have him in steel armor. He doesn't help provide soul gems for recharging but he doesn't use many either because he heals himself with his Restoration spell. This was an unexpected bonus and makes him very good and strong. He has an indignant comment when you access his inventory but it's funny and hasn't yet gotten on my nerves. He's also very good if you're in the TG because he just looks the other way if you steal.