hi guys, in the market for a new .21 on road engine. so im basically deciding between a few different engines

Picco torque .21 EDO
Novarosssi 35 plus 21
OS speed xzr

im kinda leaning more towards the novarossi because you can get the 35 plus 21 quite cheap, its fast but im thinking its abit out dated, i know you can get 2011 versions but still think its out dated. the picco and the OS im not really sure about. can someone maybe give help me out with a decision or maybe recommend a different engine. PS the engine will be only really used for club racing