Over time printer beds are known to morph and as a result; deforming your prints. However, because of glass's thermal enduring capabilities this does not happen. You can heat and reheat your 3d print surface without it ever deforming. You only need to buy one and it will last you probably as long as the printer. All other methods require replacement, so going for the glass option will save you a lot of money and time in the long run.
Also, you need to have a practical way to position the glass in place. A good way to do it is to use a non-adhesive thermal pad to hold the glass in place and transfer the heat through the aluminium surface. Another good option is to use clips to hold the glass in place on the aluminium. Make sure that the clips are strong enough to make sure the glass doesn't shift. This can become a problem especially when you are printing out something large, which causes the glass to shift.
You can add additional adhesives properties to your printing surface by placing Blue Painters Tape, Glue Sticks, Aquanet or HairsprayPEI Sheet on top of the printing glass. They all perform the same task preventing your print from sticking to the surface but each is applied and removed differently.