As discussed in another post, I open this one to get more information about AI

I planned to begin a Trenazone cycle in few months, adding Androhard in 8-9 caps/day during 5-6 weeks max.
For PCT, I planned to use Torem but during cycle and PCT I need an AI.

I saw that new sponsor was selling AI but there are in 3 types :
- Anastrozole 1mg/ml - 60ml
- Exemestane 25mg/ml - 60ml
- Letrozole 2.5mg/ml - 60ml

which is the differences between these 3 products ? For my kind of next cycle, which AI and dosage would be the best ?

I asked the question to BBG but I opened a post to share information