What do you mean?

iSecurity does the same and has same features. What makes this security plugin so different?

We are naturally going to be biased. Having said that a few points to consider:

a) Our scanning happens on our servers hence there is Minimal Load on Your Servers
b) Our biggest strength is our scanner which can find malwares that escapes most other scanners.
c) We have One-Click Malware Removal feature. So now, you do not need to wait for hours or days to clean your website but can do it at the click of a button.
d) Awesome support that people swear by

In addition, you can also refer to these comments from other Sumo-Lings who have spoke about it:

https://appsumo.com/malcare-recap/?review=29071
https://appsumo.com/malcare-recap/?review=29266
https://appsumo.com/malcare-recap/?review=29181
https://appsumo.com/malcare-recap/?review=29231
https://appsumo.com/malcare-recap/?review=29219

Hope this helps.