Before I answer your question I would like following information from you:
- Can you give Job Description for both of your Juniors. That is to say- is it a routine job or a challanging one with volatile situation which requires quick response.
- Please tell me whether the sincere fellow is under performing entirely on account of lack of some skills for which he can be given by training or mentoring.
- Fellows like the more efficient guy tend to be difficult- not a good team boy-. Have you tried to counsel him with a view to improve his team behaviour and failed.
- has your company issued some policy guidelines for pruning manpower? Normally the junior most goes first other things being equal.
- If you have rated them in past please provide your performence appraisal ratings.