COLL is definitely more useful if you use CFOP or ZZ. The algs are generally pretty nice, and it helps you learn to recognize corner permutation, which is a useful skill. It also lets you transition into ZBLL pretty smoothly. It's quite common to only know the ZBLL algs for certain COLL cases and not others.

Also, breaking it down to the numbers:

ELL only shows up in 1/162 last layer cases (CO * CP = 1/27 * 1/6)

COLL shows up in 1/8 last layer cases, and even more frequently with edge control during F2L (probably up to 1/4 without actually doing EO from the start).

You have a 1/12 chance of skipping PLL with COLL, and a 1/1 chance of skipping PLL with ELL.

Your chances of getting ELL and skipping PLL are 1/162, while your chances of getting COLL and skipping PLL are 1/96.

Someone correct me if my math is wrong...