I really like Eheim Jager's....they have the thickest glass. However, the one negative is that they are longer than all others....so make sure it fits.
The critical piece of equipment with a heater (any heater) is a controller. All heaters will fail and the dangerous failure is "stuck ON." A controller will save you from a stuck ON. Either use a tank controller, Apex is an example, or get a stand alone temperature controller, like an Inkbird or Ranco.....or if your handy, they are easily assembled as a DIY. A google search will show how to DIY.