On wall usually means less time spent fine tuning the speaker positions and less chance to make the small incremental changes you can achieve with floor standing cabinets.
Wall speakers vs floor standing.
The 1 issue is perception of soundstage.
I have a pair of monitor rs8 floor standing speakers and shifting to small flat.
Free standing speakers tend to sound the best because you have the greatest flexibility when it comes to positioning.
There are conventional box shape speakers that are floor standing or bookshelf in size.
With all that being said it really boils down to personal preference.
Buy speakers that are designed to do what you want to do.
If you prefer a floor standing speaker you will want your budget to allow the cost difference.
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Many audiophiles who love music that is small in scale like a jazz quartet love great bookshelf speakers.
There are speakers that mount inside the wall on the wall.
From a decor standpoint though a bookshelf on a stand does tend to look like its taking up less of the space in a room than a floor standing speaker with a similar footprint.
With in wall speakers you are forced to have an axis that is perpendicular to the front wall if they are installed in the walls and that would prevent any adjustment of seating location and speaker placement after the fact.
If speakers flanking the seating area of a theater can be moved off the floor and into the walls the possibility of a wine induced mishap is greatly reduced.
There are even speakers that you can plaster and paint over.
If you do not have space for floorstanders then sell them and buy some standmounts that can be mounted to the wall i e.
There is always the option to combine and do both in wall and floor standing speakers.
Floor standing speakers typically cost more than an in wall speaker.
Good in walls are especially well suited for use as surround speakers.