Question about abilities

Some abilities on certain players are available in multiple tiers for different prices. Are there differences in how effective they are? The more expensive one is better? Or no?

Also a similar question,  Gronk for example he has AKA vanguard and AKA vanguard upgraded both x factor abilities have the same description and cost the same are they any different? If so, Which one is better?

I've not heard of the same ability being more effective if you spend more training on it. I highly doubt this is a thing but I'm sure someone will correct me if I'm wrong.  An ability should play the same in game whether you spent 100 training on it or 1000.Just unlock the ability in whichever ability bucket it's the cheapest.

For the AKA x-factors the difference is the number of plays is that you have to wait before the x-factor charges up again. The upgraded one requires less plays to charge up.

Breakluna said:

I've not heard of the same ability being more effective if you spend more training on it. I highly doubt this is a thing but I'm sure someone will correct me if I'm wrong.  An ability should play the same in game whether you spent 100 training on it or 1000.Just unlock the ability in whichever ability bucket it's the cheapest.

For the AKA x-factors the difference is the number of plays is that you have to wait before the x-factor charges up again. The upgraded one requires less plays to charge up.

Exactly this. Currently the AKAs are the only x factors like this.