I have been using a Loghome for my main door for several years and am looking to upgrade it, as well as get a digital lock for my gate.
As my current set is a rim lock, does it mean I am limited to only choosing rim lock options as the hole in the door is already there?
Using back a rim lock will be the most straightforward with the least of concerns (but that does not mean none) . The hole center will be in the same position, and the hole diameter depends on the new lock and the old hole diameter ( which depends sometimes on the previous installer disposition). If you live in a condo, the door frame architrave (if any) might have a larger cutout than the new so it may not look as proper.
Using a deadbolt lock has additional concerns. The rim lock center may not match the fixed 60/70 mm backset of the deadbolt. It may mean you might need to redrill. The door frame will leave screw holes behind or a big cutout from the architrave (if any).
Using a mortise lock is possible if the rim lock is not too far above existing (regular) lock.
If the above is difficult to understand, the bottom line is it is possible to use any new types as long as the vendor has your existing door lock photos and willing to advise the aesthetics impact of each, for you to accept. Vendors may not be as objective to your interest as you think; perhaps just their interest. But ask anyway, you will find out which is better.
PS. I don't have recommendations as I don't like a gate lock (of any kind).