I visit Udupi or rather Manipal every month, Sudhir. AFAIK, both these trains are fairly reliable, particularly, 22475, under normal circumstances. However,of late, 22475 has been a little erratic due to delayed start from Bikaner on account of fog. But by and large your choice of trains is good. You can pvt msg your travel dates to me. In case you need any help while in Udupi, you can contact my daughter or son-in-law, who are based there. All the best.