Suggest which project is better

Hi

I got a chance to do project in one company on these topics.Helps me to choose which is better and relevant.

1.Speed Control of Switch Reluctance Motor

2.Seep Control of DC motor

3.Seep Control of DC Series Motor
(In all the above,the speed is controlled using modern power electronics devices)

Help me to choose and say ur valuable comments on my topics...

Tony
Thanks in advance...........