What are the differences between a horizontal suspension and vertical suspension MTB? Currently, I've got a hardtail mountain bike and love to upgrade to a full suspension one. But when web surfing, I found out there are two types of full suspensions:
1. Vertical Suspension

2. horizontal suspension

I'm curious to know the differences and pros and cons, between these two types. I just YouTubed and don't have any strong opinions so far :)
The position of shock mounts is only one variable of many of the rear linkage design. It does not play an isolated role but really is tied to everything else.
You might have missed that there are many other designs. The upper mount can be on the top tube as well:

Or really, in many other places, like in-line with the seatstays:

Or pretty much hidden just outside the main triangle:

The shock can be placed at almost any angle, or even sometimes upside down, if such a design is deemed to fulfill the purpose of the particular bike.
There are frames with multiple holes to allow adjustments or longer/shorter shocks to be installed.
With so many factors in play, it is simply recommended to try a bike to see if you like the feel.