When comparing QKSMS vs SMS Organizer, the Slant community recommends QKSMS for most people. In the question“What are the best SMS apps for Android?” QKSMS is ranked 4th while SMS Organizer is ranked 12th. The most important reason people chose QKSMS is:
When a new sms is received, a window will pop up that has the message and allows answering it from there, without having to open the app. It can be dismissed by tapping anywhere else on the screen.
Specs
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Pros
Pro Allows responding to SMS without opening the app
When a new sms is received, a window will pop up that has the message and allows answering it from there, without having to open the app. It can be dismissed by tapping anywhere else on the screen.

Pro Per-conversation notification settings
Users can set different notification settings per user as an easy way to know who is messaging without having to look at the actual message.

Pro Easily communicate with groups
Users can communicate with large groups at the same time due to the included group messaging feature. This is convenient when trying to synchronize with friends or colleagues.
Pro Very active developer who listens to the community
While QKSMS is one of the younger apps, the developer is quickly adding features/fixing bugs.
Pro Free
The app is available for free with an optional donation IAP that ranges from $1-$10.
Pro Beautiful design
Responsive, highly customizable Material Design interface makes for a native looking app that fits in well with Google's UI design guidelines.

Pro Save yourself from sending out bad messages
Through delayed messaging one can set it up so that a message is not sent automatically. This can help for those times that it may be best to think something over before sending out a rash message.
Pro Readable in day or night due to themes
There are light and dark themes available within the settings which can be switched depending on how light it is around one when using the app. The dark theme can also help to conserve battery when being used as not as much brightness and hence battery will be used.
Pro Schedule messages
Users can schedule messages to be sent for later.

Pro Convenient Android Wear support
Those that own an Android Wear device will be able to set it to receive their messages on the Android Wear device making for convenient notifications and easy messaging through not having to take their phone out.
Pro Smart Assist
Check PNR status, check Flight status, Check-in directly through the SMS reminders itself. You need not open multiple apps, SMS organiser will take you to the right webpage through reminder cards and help you close your important tasks.
Pro Smart Reminders
Never miss your appointments now! SMS organiser will send you automatic reminders of upcoming trains, flights, buses, movies and even bill payments in time. You can also create a custom reminder to help you remember important events.
Pro Hassle Free OTP
It does a great job when you receive OTP. Shows at the top of the screen, you can copy OTP and it gets deleted automatically.
Cons
Con Last update was 2021
Con Buggy
There are little annoyances here and there, from dark theme problems making text unreadable to crashing and missing notifications.
Con Lacks features compared to other offerings
Con Cannot set custom notifications
Con Limited options to personalize groups
Con No archive option
