I would argue that levemir is more flexible, but it's a question of whether you personally need that flexibility. Some people have issues with lantus, eg if it doesn't last the full 24 hours or if they need a different basal rate in the day and night. So I can understand that your team might argue that levemir is more flexible, and I would urge you to put the work in to achieve the correct dose on it.
But it's your body, and your insulin needs. If you give it a decent try (much more than a couple of days) and still prefer lantus, then there is nothing to stop you from telling your team this. But am slightly confused why they are suggesting the change if lantus is perfect for you?
(Personally I've had some issues with lantus, which I split as a result, but New Zealand doesn't offer any basals other than lantus, so I make it work for me.)
My recommendation would be to give levemir a good try before requesting a return to lantus. I would agree that levemir is more flexible, but it's also possible that you don't need that flexibility. Good luck.