Yes, I have a Livi and a YoYo (makes mental note to get both side by side to compare!)
I think you need to look at the two pushchairs in a different way TBH.
The YoYo is the ultimate in small compact folding, easy use pushchair. The trade off to that is that its not quite as detailed or as big.
The Livi meanwhile is a slightly bigger pushchair with a lie flat, suitable from birth seat, with a bigger hood, bigger basket, pull out calf rest etc. But as a result the folded size is a bit bigger too.
There's no doubt really that the Livi is the bigger...I want to say better but I dont think it is....hmmm.....more like a regular pushchair (does that make sense?) but the beauty of the YoYo is in the size.
I do have a photo of the Livi, YoYo and Oyster Gem all in my car boot together, but I can't show you it tonight. I will try and get the two side by side for you to look at. But there is no doubt you will look at the Livi and decide its got the bigger, better seat. However for me although the Livi still has a very very neat and small fold compared to most, the YoYo is just that bit neater and therefore more handy to have.
If you dont need a really dinky fold, then get the Livi. But there's nothing like being able to put the YoYo in your footwell, by your feet, under a chair in a theatre or under a table at dinner etc. But to be fair, the Livi does freestand really very nicely which has its own advantages for storage.
I took my nearly 5 year old out for a spin in the Livi yesterday and she was easy peasy to push up and down steps. She was pushed across grass a few months ago in the YoYo.
I think both pushchairs feel good. The YoYo definitely feels smaller and neater. There is a bit of movement in the Livi handle but it was fine with our eldest in - which TBH was where I expected any issue to be. But it passed that test with flying colours!
The YoYo fold is defintely one handed once you have done the first stage. You can fold the Livi one handed past the first stage too although as we discussed on here, the fold lock needs 2 hands to put on whereas the YoYo autolocks. The fold is very similar though but you have the hood to contend with, with the Livi (an extra step to fold it down). You could leave a child in the YoYo seat for the first stage, and then complete the fold with the child tucked under your arm. However you would need to remove the child from the Livi seat (unless you dont use the hood) for the complete fold.
Both pushchairs are great but you absolutely need to look at your precise reasons for buying either. They are tiny folding pushchairs, and with that comes small compromises. So its really whether you need the small fold, and if so, do you need a one handed fold or not, or whether the fold size matters. If you dont need a small folding pushchair, then there's loads of other neat folding bigger pushchairs too. Does that make sense? I wouldnt take the YoYo out on an all day trip - I would take a bigger pushchair. However I would, and have taken the Livi out all day. I think maybe thats important to note too?
Sorry this all feels a bit messy. I hope I make sense!
Whatever both pushchairs are FAB! I own both, and both for now are staying here! I have had my YoYo now almost a year which is almost a record for me!