I don't think Grams is a very good token. It is just created by Telegram to get some hype and earn some money. We all know Libra is coming next year. Telegram just want to be in that race with Facebook. I think you should better go for some big currency which has a lot of potential to grow.
Gram / TON project is older then Libra and the two beasts are very different. If you have time and desire you can read up white papers here:
https://test.ton.org If TON copied from anyone then from ETH and generally blockchain idea which is not a bad thing.
But I do believe that it is too speculative right now. The project will be very interesting though for long term investment once investors have cashed in (within 18 months).