You showed the frames:
Strada 87 Cromor
Professional 85 SL
Corsa Extra 93 SLX
Pro 84 753
Strada is the lowest model in the EMC hierarchy - Cromor tubing, then Cromor/Gara, finally Brain OS and cheaper frame components.
The build quality was identical for all EMC models i.e. high.
By the way: Corsa Thron was produced very shortly in 1994.
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