I would highly recommend the Finnish company iLOQ in your case and specifically their systems S5 or S10. We’ve used iLOQ at our coworking space and cultural hub Blivande in Stockholm for several years and are very pleased with the product so far.
The USP of iLOQ is that they blow all other competitors out of the water in terms of pricing whilst still delivering a robust and easily managed digital access system. They’re able to accomplish this with their patented solution where the electricity required to verify the access right programmed on the RFID-chip of each physical key is generated by the kinetic energy of the same key being inserted into the cylinder.
This means that every cylinder is completely self-sufficient in terms of power and can be inserted in any door without the need for very expensive cable installations or motor locks.
I don’t know where in the world you are but here in Sweden a motor lock + the customized cabling/installation required for each door can cost upwards of 2500 EUR or more per door. With iLOQ you simply pay 300-400 EUR per cylinder and another 20 EUR per reprogrammable key and that’s it aside from a negligible annual license fee. If you’re somewhat handy you can probably do the installation yourself although your insurance company might disagree.
They also offer custom locks such as padlocks, cylinder for lockers and stuff like that. You can buy tiny batteries and insert with the cylinder that lasts for years if you want to retain access logs.
The only real drawback I’ve discovered so far is that their admin software only runs on Windows. I guess it might be possible to make it work through WINE or something like that but I haven’t tried myself so can’t be sure.