Two things to consider:
1: Tel H (telmisartan80mg+Hydrochlorthiazide 12.5mg), is working by exerting its effects on the kidney.
2: Amlodipine 10mg, is working by exerting its effects on the blood vessels.
Hence, you can't compare the two drugs effects by their strength since they are acting at different point.
Amlodipine can have a huge effect by lowering your blood pressure through the method above and hence control your blood pressure.
Though, the choice of antihypertensive requires to know other factors like:
Age, Race, presence of other diseases/comorbids like diabetes mellitus.