I don't know exact numbers, but I'm guessing the 2nd guy is worth good money since he has high salary and is listed as SF, which usually means many skills for his (already high) salary. But, without knowing the exact skills it's hard to say.
Depending on your training abilities and plan, I think selling in 2 weeks would bring in most money. Try to get a good skill to pop to Strong, and because most trainees are sold in the first weeks, a bidding war on your player is more likely after 2 weeks.
The 1st guy won't get you any money right away I think, low salary and 19 year old. However if you can train him you could haul in some money. I managed to buy players below 10k and sold them for close to 100k before the end of the season.