Personally I'd go for the plastic, double glazed, tinted jobbies that most campervans/motorhomes have fitted nowadays. You can easily install rollup blockout blinds and or insect screens to each window. Most open right up to let the breeze through.
Plastic is a pain if it gets broken - but I've seen an old VW with a glued together window so they are a DIY repair whereas moulded and laminated automotive glass is definitely return to supplier for replacement.
Security - if someone is determined to get in security grills wont stop them, just takes them a bit longer or they use a longer crow bar to really damage things. You are only stopping the sneak thieves and probably putting a big sign on the vehicle saying "rob me, I've got valuables inside" with the security screens installed. You can get internally installed wire mesh/insect mesh style security screens, but they need to be built in.
Trouble with all security screens is, if they cant get in, you cant get out in an emergency - plenty of people die in housefires because of security screens on all windows - housefires are a lot less common than vehicle accidents.
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