Yamaha PSR-S670 or Casio CT-X5000 | CT-X9000IN

Is the almost 3 years old Yamaha PSR-S670 still relevant in 2018 especially when Casio launched their new AiX wielding chipset Casio CT-X5000? Singapore Keyboards Information http://keyboards.SG International Keyboards Information ✔️ KORG EK-50 https://amzn.to/2WsDP7Y ✔️ Yamaha PSR-S670 https://amzn.to/2Lto2B1 ✔️ Casio CT-X5000 https://amzn.to/2MWuGyC ✔️ Yamaha PSR-EW410 https://amzn.to/2NA7GdQ ✔️ Yamaha PSR-E463 https://amzn.to/2rkxxc4 ✔️ YAMAHA PSR-E263 https://amzn.to/2ur74uZ ✔️ YAMAHA PSR-E363 https://amzn.to/2LJE21i ✔️ YAMAHA PSR-EW300 https://amzn.to/2sl8JBQ ✔️ Casio CT-X700 https://amzn.to/2Md5o0b ✔️ YAMAHA PSR-S975 https://amzn.to/2Mnstgb ✔️ YAMAHA PSR-S775 https://amzn.to/2Oy3dEM