I think my DS has outgrown the Britax Marathon in my dads car. He has a clicktight Britax booster in my car but not sure I want to spend so much money for another car seat for my dads vehicle.

I’m partial to Britax but looking for recs since I’m not wanting to spend a ton of money. He’ll be needing a booster—he just turned 5 and is over 50 lbs and I believe over 48”.