If you have glasses you will want the OTG since these are developed to fit a set of glasses into the goggle and helps to keep glasses from fogging. Thermal are the suggested lens and are well worth the extra money. If plan on playing any more than once a day then get Thermal, most single pane lenses will not make it past one game without fogging. Colored lenses offer some advantages over clear lenses in some situations, but clear are the best all round lenses for all conditions. Amber are good for all but extremely intense glare.
Smoke are good for bright days and general.
Rose are good for overcast days. Some find that using a different tinted lens can help to pick out the camouflage patterns of some combats. Though I have no scientific prove of this, some believe it is true. Superior Firepower Inc. Sorry for the very few pics. Hope the have this remedied soon.