I would go for Job 1, technical skills can be brushed up through practice and self learning, but opportunities to brush up ur soft skills can only come from experience and exposure to negotiations and interaction with end user/client side.

Technical stuff come and go as technology moves on, but soft skills remain with u forever.

I dunno what's the extent of your user interaction with job 1,  but if it's meeting the client, assisting project manager on the technical discussions, then by all means go for job 1.

I joined my company as fresh and had to follow project manager go meeting, it's like this, there's nothing as handling client is tough for fresh, then u're thrown into the water u'll just have to learn how to swim. I got lucky because there is a senior with me in meeting but sometimes he is not around and I have to take in all the bullets.