The Mr Heater Portable Buddy is the stronger overall heater when judged on raw heating power and off-grid usefulness, and it earns excellent customer satisfaction—especially among campers and users heating small enclosed spaces quickly. Its main limitation is that propane combustion brings extra safety and usage responsibilities, plus ongoing fuel costs.
The Lasko 751320 is the better fit for typical indoor living: it’s slim, very lightweight, and adds the comfort conveniences most people want (thermostat mode, timer, oscillation, and remote). Its main drawbacks are mixed thermostat feedback and a noticeable pattern of reliability complaints from some buyers.
If you want a bedroom-friendly plug-in heater, pick Lasko. If you need portable heat where power isn’t available, Mr Heater is the clearer choice.