Hello Shannon and Read.
Basically a pacemaker is a box of two components, a circuit board and a battery.
As electronic technology and battery technology advance at speed, then so does pacemaker technology.
Electronic advancements make them smarter, battery advancements make them smaller.
Mine was last changed three years ago and is doubtless now obsolete.
There are so many different boxes, by different manufacturers. They cover all needs and lifestyles, from the young fit athletic male who wants to continue that lifestyle, to the sedentary old lady who potters about.
In your hospital there should be a cardiologist backed by technicians who specialises in pacing.
Do not take advice from a non specialist cardio on this. It's a fast moving field and you need up to date specialist input. They should be able to help you to an informed decision. Be reassured there are no shoddy brands or models out there, they all undergo rigorous testing and accreditation before used.