to stroll or not to stroll

I am trying to decide if I should bring a stroller on my trip or not. In the past I have always used my Ergo carrier and it has worked well. However, I have a five hour lay over in London and I think a stroller may save my back and my sanity. I have been offered a sit and stroll to borrow but it doesn't have a basket on it for my carry on bag and my mother has a car seat for me when we get to Spain. I think I will still bring my Ergo because my daughter does not love the stroller, but she may hang out in it in the airport if we are walking around and she might sleep in it, which is what I am hopping for. When she was little she would sleep in the Ergo but those days seem to be over. I am only concerned about another piece of luggage. I only want one checked bag and one carry on bag. I think navigating a stroller and a checked bag is a pain, I am going to ask my mother to come into the airport to get me so I don't have to get everything to the curb by myself. On the way home I am scheduled for a night in London I am going to try to get this changed but so far the airline has not been very agreeable. So we will see how this all goes.