Anyone have any experience with either or both of these tools?
From my research:
Lots of Ads: more countries, been around longer, more ads, more expensive
Social Ads Ninja: on the upswing, better interface, cheaper.
Do either platforms let you see the specific interest targeting of an ad?
Yo, haven't used either but the last questions is definitely not possible. Each spying profile could like certain pages/things to simulate certain interests but we don't know exactly how Facebook categorizes people into these, and knowing ad interest targeting would utterly ruin the Facebook economy. You don't want that functionality.