Type and frequency of arena crystals the UC+ Grinders open?

IcePick

I grind all the milestones below the five star feature and am trying to amass units. I open the uncollected crystal each time I have 1 or 2. Lately, however, this has been agonizing as I have gone 30 or so crystals without units. For those of you who grind arena constantly (and are uncollected or above, obviously) what type of crystal do you buy and how frequently?

SpideyFunko

basic whenever I need like 5 units

Hoitado

Basic crystal after 2-5 accumulated

I have this issue where I open it as soon as possible

One time I popped 15 at the same time (10 in one batch 5 in the other) and no units not even 15

The_Sentry06

I open basics whenever I'm just shy of a revive or health potion or something but always end up pulling gold.

IKON

Uncollected crystal after 2-5 accumulated

Always the UC Arena Crystals. There is no better spin in the game then 225 units from one of those.

There's also a fundamental misunderstanding of the arena crystals. They're the same as the difference between a $1 slot and a $5 slot, same odds, you're just betting more. With the larger bet comes a bigger jackpot though (5* Punisher).

Ultimatheory

Uncollected crystal after 50+

When summoner appreciation is on. Sitting on almost 2 million BC’s atm waiting for the next one.

Crys23

UC crystal, once or twice a year, about 5mil BC at a time

TrashyPanda

Uncollected crystal after 50+

UC crystals when we get a gold-boost event.

Mobile_P0tat0

Uncollected crystal after 10+

I avoid the regular arena crystals, I have no use for the 3* punisher dupe