I'm looking for a stroller for my 3 years old son with autism. I'm thinking of McLaren XLR, XT or arc. I'm not sure what's the difference between them. I need a stroller that is big enough for a tall toddler and will last him till his 5 years old at least. Can you please advice if any of them are any good/big enough. Any advice on different brands. I would appreciate any recomendation/suggestion.