IE Shiv RFC vs IE Shiv Botrk?

I feel like you lose some damage,(especially vs tanky targets),sustain and dueling power with the IE Shiv RFC build,as oposed to IE Shiv Botrk on champs like Tristana,twitch,xayah etc,am i wrong? I mean the higher price of Botrk probably makes it obvious that its a better item,maybe the 2 zeal items are just a power spike thing,your thoughts?