Unless things have changed, the HiPoint takes a proprietary single-stack 10 round magazine.
The KelTec can be had in a configuration that will handle Glock 17 or Glock 19 magazines, I have the Glock 19 version. Either of the 9mm Glock KelTecs will also accept Glock 18 magazines, which are significantly more capacious (30 rounds plus). The KT also has a factory accessory light rail available for it, which will accept any of the rail mounted lights, either LED or incandescent. I have no qualms about using the KelTec for defense, I've found it completely reliable with good ammo and Glock magazines. The foldability can be an advantage for transport.
We went through HiPoints and KelTecs looking for an acceptable alternative for my elderly mom to use for HD, when her 20 ga. double barrel got to be too much to handle. We eventually settled on a Beretta CX4 Storm in 9mm, as she found that design easier to handle.
lpl/nc