I'm not quite sure as I am still studying and experimenting on it too.
But they are still another best option to promote our SFI business and to get some interested sign ups.
We do need to expose ourselves in both programs as we are also involves in ads promotion.
Text Ads Exchange exchanges two ads between two party and your ads will travel following the other party's promotion.
Safelist is that your ads travels to another party's members list.
One thing good about both is that our promotion goes down to people who are in the same interest and in the same field. Another words is, your ads has more chance to be view and read by like minded society.
Get involve with viewing ads will at least gives you idea on which ads captures your interest while viewing other's ads. So anytime, you can just adjust your promotional ads to suits your viewer's tastes.