I'd say GRS as:
- Old coin (2014, so you can trust the devs) and very tech-centric coin
- Everything BTC/LTC wish to be: instant transaction, zero fees (more precisely almost zero: sending 10,000 GRS will cost you 0.000045 GRS), private transactions, mobile/desktop wallet, payments available via SMS
- Devs were primarily focused on tech before launching marketing campaign, contrary to most coins these days...
- Will focus on being added to many more exchanges
- Current price way below its ATH ($1.6 vs $2.7)

Pretty sure it is quite a safe bet for the long term.