I like to see Vegeta going up one level compared to his Freeza saga self, as that seems to fit well with the fact that he kept training (stated by Bulma, that Vegeta is never around at noon), but the still overall lack of information on his standing. I feel Piccolo is implied to be somewhat close to Vegeta due to he being still mentioned by Goku alongside Vegeta as someone who could have brought Freeza down, but still behind the Saiyajin, of course, as the status quo isn't implied to change.
Trunks, on the other hand, said that he was sure he'd bring Mecha Freeza down in seconds and even encouraged him and his father to go at him at full power, which tells me that Mecha Freeza, who should be on Namek ssj Goku's level based on his statement of 'maybe' taking down Goku alone, isn't much to Trunks, implying this latter is considerably above Namek Goku and therefore considerably above base Vegeta from the mecha freeza saga, whom I assumed to be at Namek Goku's level.
Said that, I think Trunks is likely to bring even Piccolo and Vegeta down when those two are fighting together, even moreso if Vegeta isn't willing to cooperate.