K.N.
I have not used either. I have twin boys who are 21 months and we purchased an all-terrain type of stroller. It can be used for jogging, walking, everything. It can be pushed through gravel and sand, grass, snow - it's awesome. It's made by Mountain Buggy and it is pricey but we love this stroller.
I know a mom who has twins who is selling a JEEP brand double jogging stroller that is in like new condition for $40. She is in the Detroit Metro area. You can email me at ____@____.com and I'll give you her contact info.
If she just wants one to 'try out' w/out spending a lot of $$ then I would recommend purchasing one that is used but in like-new condition. She'll save a lot of money this way and then if she finds that she is using it all the time and sticking with it she can always purchase a new one that is better.
She should be able to find some listed on craigs list, and at mom to mom sales.
K.