string.xml for all resolutions

im a little bit confused. im doing a string.xml for all resolutions. is that the better way? or where i can change styles in textviews or any element dependly resolution of device? like

winLabel = Ti.UI.createLabel({
        color: '#019FCE',
        center:'0dp',
        text: "Monto a Cubrir",
        font: {
            fontSize:'20sp',
            fontFamily:'ABeeZee-Regular'
        },
        height:'auto',
        textAlign: 'center',
        wordWrap:true,
        width:'95%',
    });