When comparing AirDroid vs SHAREit, the Slant community recommends AirDroid for most people. In the question“What are the best Android apps for WiFi file transfers?” AirDroid is ranked 5th while SHAREit is ranked 8th. The most important reason people chose AirDroid is:
As of 23/11/2015, the price for Pushbullet Pro is $39.99 yearly/$4.99 monthly while AirDroid Premium is only $19.99 yearly/$1.99 monthly/$38.99 biennially.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Premium is cheaper than Pushbullet Pro
As of 23/11/2015, the price for Pushbullet Pro is $39.99 yearly/$4.99 monthly while AirDroid Premium is only $19.99 yearly/$1.99 monthly/$38.99 biennially.
Pro It's a Swiss Army knife of cross-device functionality
In addition to SMS management and notification mirroring, it includes the ability to transfer files, URLs and clipboard, view through the camera lens of the Android device on another device, and completely control all functionality of a rooted Android device on a different device.
Pro Straightforward SMS manager
In addition to allowing you to send and see incoming messages using an intuitive interface on a computer, the app also allows you to manage contacts.
Pro Supports cross-device notification mirroring
SMS and app notifications as well as incoming call notifications are mirrored on the connected devices.

Pro Cross-platform desktop and mobile
Apps available for Android, iOS, Windows Phone, Windows, and Mac.
Pro Free
Cons
Con Considerable delay when sending SMS messages via computer
Messages sent via computer can sometimes be delivered to the recipient with a delay of up to 10 minutes. Because of that holding a conversation might be difficult and it can needlessly drag out.
Con No MMS Support
src/org/kde/kdeconnect/Helpers/TelephonyHelper.java
Con Unstable
This software is likely to crash.
Con Developers have been known to install adware
SHAREit is developed by Lenovo. In 2015, Lenovo was caught shipping computers preinstalled with man-in-the-middle adware called Superfish.
