Well it depends on what you mean by better and who you ask. Currently there are no less than 8 companies marketing their fin systems to surfboard manufacturers and the public and they all claim certain benefits. From a manufacturer's point of view there are benefits also, even with the increase in price for most fin systems.
Production is slightly faster, especially in the sanding and polishing department.
Sanders who cut their teeth for years working around three glassed-on fins became quite good at their task and now their job has been simplified. The pay scale may have slightly dropped, but more boards can be sanded in the same amount of time. Also, installing most fin systems is rather simple, involving less fumes and less risk of mistakes due to resin going off too quickly. Finally, boards pack way more efficiently for shipping purposes and receive less damage when they arrive to the surf shop. Also, with the fins removed, retailers can nearly double their surfboard inventory in the same amount of floor space.