Shower Waterproofing

What do members you think? Below are recent prices in my area, Washington DC, per sq foot

Permabase wp 1.00- allegedly water proof cement board , indisputably the most rigid strong of this group as it's not foam

MITEK triton 1.20

John's manville Go board 1.66

RSS pro board 2.35 plus shipping

Hydroban 2.67

Schuleter tho aftern after seeing Issac's video not impressed by its fragility

Sentinel cement 3.00

wedi 4.35