If you want to learn about technology then work at the smaller company. If you want to learn about business processes then work at the larger company. However,

If you want to learn about technology then work at the smaller company. If you want to learn about business processes then work at the larger company. However, you'd learn more from the smaller company if it only had 7-10 people. Furthermore, you can learn about technology in your own time. Therefore, I'd recommend working in the larger company.