Depends on a lot of factors that aren't here. Strictly speaking for this year and playerwise, I like Diggs better than anyone else in the trade. Lindsay is a close second. If we knew he was going to keep this production up then he would probably be the best player in the deal. If I'm playing to win this year, I take Team A and it's not even close. On the other hand, if team B doesn't need Lindsay and Diggs because they are stacked at RB and WR, then it's not a bad deal to grab a first rounder next year.
I always play for this year though, so I would still take Team A.