Like or dislike, it's a personal choice.

But be sure you understand the 'physics' of what you are choosing.

An 'uplocking' seat is used by most manufacturers because it's easier to install/build the rod. You can leave off the tightening apparatus, including the movable parts like hood/rings that make annoying noises while turning the finish on the wraps. You can use a less cosmetically pleasing, and thus cheaper to manufacture, front hood if you are burying it under the grip. Repairs to an uplocking seat that strips a tightening ring or bends/tears a rear hood are relatively simple.

The reel location on an uplocking seat is closer to the tip of the rod by an inch or three. This effects the fulcrum point, where it's most conmfortable to hold the rod versus where the reel exerts the most balancing force on the rod (you cn't effectively 'balance' a fly rod, but the more 'swing weight' the reel exerts, the more effortless the cast will 'feel' and the easier the rod will be to 'stop' in either direction).

On a downlocking seat, the reel location is farther back from the tip of the rod buy an inch or three. This moves the swing weight of the reel back, increasing it's effect on the cast.

Whether this is important at all, or even noticable to the caster, is unclear.

An uplocking seat lets you set the butt cap on the ground and keep the reel off of it. But it also has that annoying habit of catching loose loops of line.

A down locking seat has a 'gap' between the grip and the front of the reel, in which are all that tightening hardware. Some find this arrangement less aesthetically pleasing than the uplocking version.

It's a choice. That's all, no right or wrong.

Good Luck!

Buddy