Buy a cobb if you want something you can use under shelter. The magma are great for hotter climates but your cobb can used under cover and the outside does get hot etc so you can also take ashore.
The bricks for the cobb are quite scarce so if you buy a cobb lay a good stock in if interested in serious roasting etc . Also be aware there are some out there selling copycat cobb bricks which don’t light apparently so like anything be careful if you are offer too good to be true.