Despite their higher prices, good smart locks bring more convenience and felxibility. They have a solid metallic build, and their sensors (e.g. bluetooth) can sense your presence smoothly, with as few bumps as possible.
The best smart lock for normal use: Kwikset Kevo Smart Lock 2nd Gen(versatile, easy to install, Kevo Plus upgrade has remote control)
The seond best smart lock for normal use: Schlage Connect Touchscreen Deadbolt ( Z-Wave keypad option with alarm, smudgeproof keppad)
The best smart lock to add to your existing deadbolt: August Smart Lock HomeKit Enabled (remote access via wi-fi) - Also has a HomeKit option option for Apple.