I would sell the first guy and keep the second one. The first one is already 19, and I don't like his initial skills too much... Besides, that "hall of famer" tag should get you an overpriced deal and then you can buy a better trainee. I honestly don't know why people focus so much on the potential when most of them won't get even close to seeing the potential cap...
The second guy has decent starting skills for a big man and he's tall, so you can also contact your U21 manager. That respectable OD is a good secondary, means you can often put him defending the opposing 4