And? Howe has took Bournmouth from League two to the Premier League. Also Dyche failed at Watford so your argument doesn't make sence.
Dyche was actually a success at Watford, but became the first of many sackings by the Pozzo family.
"Mackay left [Watford] to join
Cardiff City in June 2011, and Dyche was promoted to manager. Watford finished the
2011–12 season in 11th place, the club's best finish for four years, but a change in club ownership led to his dismissal at the end of the season."
Howe has taken Bournemouth from League Two to the Premier League, but in two spells. He did get off to a flying start. However, he didn't transform Burnley in the Championship.
"Howe returned to Bournemouth as a youth coach under
Jimmy Quinn and took over as caretaker manager when Quinn was sacked on 31 December 2008. Even though his two games in charge as caretaker manager were away defeats, he was hired as the permanent manager of the club on 19 January 2009 and brought the club out of the relegation zone despite a 17-point deficit."
Credit goes to the Burnley board who appointed two promising young managers in a row. They have both seen two sides of football, winning promotion and fighting against relegation.