There are many version of Magento But I felt 1.9.x is a bit easy to install and having fewer bugs when compared to previous versions. It also supports rest and soap services which will help us to develop other supported application with the help of these services. Even many Companies are helping us to create Free Mobile software with some limitations and even then are helping to generate Mobile applications by using simple plugins. I am able to generate multiple Mobile applications for this version and successfully executed it. But I felt all the free applications are not suitable for Groceries selling. Because the user will not spend much time in buying groceries. But with little cost, these companies are providing customised mobile application which can easily be integrated with Magento 1.9.x. But still, I believe this is not recommended for Groceries like product if you want to use it intact without any customization.
I also deployed demo store for your reference.
|Environment & Technologies (I am using Hostinger India )|
|Web Server: Apache 2.X|
|Language: PHP (5.4 to 5.7)|
|Demo Site: Magento 1.9.x|
|official site: https://www.magento.com/|