6X DLC vs Tactix Delta £50 difference ?

I've just had an email about Tactix Delta watch

https://buy.garmin.com/en-GB/GB/p/696005

It's £50 more than the DLC Saphire 6X

https://buy.garmin.com/en-GB/GB/p/641435/pn/010-02157-11

Anyone know the difference ?