Here are mine. What are yours?
Nords - Spark F1 (Recommend offline race, ghost or online practice mode with invulnerability and waiting up for folks when they crash, etc.)
Toban - Skip Barber (and almost any other car, too! This is also great in rFactor 1 with 37GP mod)
Motorsports Ranch - Skip Barber (I prefer Regional but very challenging so National is great, too, if you find Regional too frustrating on this track)
British GP - F3 international layout - Spark F1 (also excellent in rFactor 1 with Historix Porsche 906 prototype, especially with Game Stock Car Mini tire sounds)
Lientz - Spark F1 (everyone should also experience Lientz in rFactor 1 with 37GP mod before they die)
Mountain forest - Spark F1 (and almost any other car, too!)
Essington Park - Lola (online multi-class races at Essington Park have been epic!)
Oran Park - Spark F2 (one word.......intense! )
Poznan - Megane (and almost any other car, too!)
Black Hole Ring - Spark F1
Salem Valley - Spark F1
Sebring (12H) - Lola
Topeka - Long layout - Spark F1 (one word.........fast!.........OK two words --> fast AND SLICK! RUBBER IS CRITICAL!)
Pocoyo Park - Spark F1 (and almost any other car, too!)
Mills Outer Loop A - Spark F1 (long sweeping decreasing radius left hander into tight S-turn is sublime ; too bad not raced online more but I think it has something to do with mod packaging)
Putnam Park - Spark F2
Palm Beach - Spark F2 (excellent online race combo!)
Lutzland - Skip Barber
Botniaring (long) - Spark F1
Sears Point - Spark F2 (and almost any other car, too!)
Croft - Spark F2
Nords - Spark F1 (Recommend offline race, ghost or online practice mode with invulnerability and waiting up for folks when they crash, etc.)
Toban - Skip Barber (and almost any other car, too! This is also great in rFactor 1 with 37GP mod)
Motorsports Ranch - Skip Barber (I prefer Regional but very challenging so National is great, too, if you find Regional too frustrating on this track)
British GP - F3 international layout - Spark F1 (also excellent in rFactor 1 with Historix Porsche 906 prototype, especially with Game Stock Car Mini tire sounds)
Lientz - Spark F1 (everyone should also experience Lientz in rFactor 1 with 37GP mod before they die)
Mountain forest - Spark F1 (and almost any other car, too!)
Essington Park - Lola (online multi-class races at Essington Park have been epic!)
Oran Park - Spark F2 (one word.......intense! )
Poznan - Megane (and almost any other car, too!)
Black Hole Ring - Spark F1
Salem Valley - Spark F1
Sebring (12H) - Lola
Topeka - Long layout - Spark F1 (one word.........fast!.........OK two words --> fast AND SLICK! RUBBER IS CRITICAL!)
Pocoyo Park - Spark F1 (and almost any other car, too!)
Mills Outer Loop A - Spark F1 (long sweeping decreasing radius left hander into tight S-turn is sublime ; too bad not raced online more but I think it has something to do with mod packaging)
Putnam Park - Spark F2
Palm Beach - Spark F2 (excellent online race combo!)
Lutzland - Skip Barber
Botniaring (long) - Spark F1
Sears Point - Spark F2 (and almost any other car, too!)
Croft - Spark F2