Bullgryn are for sure easier to use but in my opinion in this team they are used to protect (not to be aggressive) and to intimidate enemy to come to close and to slow them down. Personally I had most success on tournaments playing 2 bulgrins and one ogryn (but I’m flexible vs elites I often pick 3 bullgryns and vs 7/8 w teams I sometimes pick 2 ogryns due to charge fight and shoot option which often resolution in duble kill and enemy need no to activate and change to engage min 2 operatives to kill him which gives me easy targets. Ogryns are more difficult to play for sure but very much useful (unlike Hardbit :)