When comparing Snapchat vs QKSMS, the Slant community recommends QKSMS for most people. In the question“What are the best messaging apps for Android?” QKSMS is ranked 7th while Snapchat is ranked 42nd. 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 sharing photos, videos and texts that self-destruct
All Snapchat communications disappear after they've been viewed. It creates more interesting conversation when you don't have to worry about consequences as much. Additionally you can doodle on photos.
Pro Includes news
Snapchat includes a Discover page (accessed by two swipes from the right side) where curated list of news and entertainment outlets can put up news from their sites.
Pro Does not get in the way of what it's designed to do
Snapchat is first and foremost a way to share photos so the first thing that the app presents the user with is the camera enabled and ready to take photos. Once photos or videos are taken, it's possible to caption them or draw on them.
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.
Cons
Con Security concerns
In 2013, Snapchat was hacked. As a result phone numbers and usernames of 4.6 million users were published online. That happened after concerns were raised by a security firm weeks before that Snapchat dismissed. Other security concerns were pointed out to Snapchat throughout 2014 including ways that the service could be used for DDOS attacks and how their anti-robot measures can be circumvented.
Snapchat has since implemented two-factor authentication.
Con Non-intuitive UI
The UI space is well used but you'll likely miss a few messages until you understand of the UI works; it's not like the average mobile apps.
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
