Heatsink bar dimensions for passive

Which one is better for passive cooling 3x 1212 at 1050 mA?

500 x 150 x 25 (17 fins) or 500 x 125 x 35 (11 fins)? Base thickness is 5 mm on both. One have less fins, but have more height... Other is oposite. DIY LED calculator have strange numbers so widther is not better as I would aspect.

Can someone please calculate me numbers?

if you search i think all the info needed to calc these is around on the site. theres a whole 100+ page thread for passive heatsinks