Snorkal

Hi as im quite new to this LR business, can you'se tell me what the difference is between a safari snorkal and one with a mushroom top, which one is best to buy for the odd weekend greenlaning and offroading and where is best to buy one from.
Also looking for help on where to buy other parts from ie guards etc.
Thanks

buy a landy mag and look at all the sellers in there, plenty of places that sell there own guards and stuff or are dealers for manufactorers

and the diff? cost, pure and simple, southdown also make a good snorkel