Shop mileage boxes Info B A or S, which one should I choose?

***Edited due to improvement of the reward on 29/07/2559***

Rules:
1. Spend rubies on Chole's summon shop and get some points to fill the box guage. (if you spend rubies on keys or golds from other shops, you won't get points.)
2. When you fill the first guage (1,500 rubies), you can collect B box and or continue to fill the second guage.
3. When you fill the second guage (1,500 rubies), you can collect A box and or continue to fill the third guage.
4. When you fill the third guage (3,000 rubies), you can collect S box.
5. If you collect B, A or S box, you will lose all your points and have to re-start the first guage.

** To get B box you have to spend 1,500 rubies in 1st page of the shop
A box use 1,500+1,500 = 3,000 rubies
S box use 1,500+1,500+3,000 = 6,000 rubies
Thank you, 이수 for this information.

So which box to choose, you can see for yourself

S-box will randomly give you one of these: (one of these 23 units) (spending 6000 rubies)
- Dark knights - Melcure
- EM or OEM
- 7K
- 7K pet

A-box will randomly give you one of these: (one of these 51 units) (spending 3000 rubies)
- Dark knights - Melcure
- EM or OEM
- 7K
- Luminous
- Night crow - Karl heron
- 7K pet
- 4* Normal pet
- 5* Element
- Pina, Reah, Rainbox rice cake

B-box will randomly give you one of these: (one of these 24 units) (spending 1500 rubies)
- 4* Normal pet
- 5* Element
- Pina, Reah, Rainbox rice cake

***All units have same probability to summon. It mean if you open S-box, the chance you get yeonhee is 1/23, the same as Melcure, Rudy, Wukong and other units in that box.

Credits By Chayklang Goldsand

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Saturday, July 30, 2016