There is a clear difference between the candle and oil lamp, yet the latter is much safer. It is observed that the top of the line oil lamps are much safer than the conventional ones and as a result, safety concern is lower than a candle when the position of the flame gets lower or the issues that may cause when the candle burns down.
Moreover, using an oil lamp can be an affordable price option as the same can be reused, unlike the wax candles that are effective for one-time use only. The expensive the lamps, the better is the quality of the same in the long run. A good lamp will cost you negligible in comparison to the candles.