webflux reactor API vs webflux kotlin coroutine

ServerWebExchangeMatcher.kt

// Before Coroutine
fun matches(exchange: ServerWebExchange): Mono<MatchResult> {
    return Mono.just(exchange)
        .map(ServerWebExchange::getRequest)
        .map(ServerHttpRequest::getHeaders)
        .filter { header -> header.containsKey(HttpHeaders.AUTHORIZATION)) }
        .flatMap { MatchResult.match() }
        .switchIfEmpty { MatchResult.notMatch() }
}

// After Coroutine
fun matches(exchange: ServerWebExchange): Mono<MatchResult> = mono {
    val request = exchange.request
    val header = request.headers

    if (header.containsKey(HttpHeaders.AUTHORIZATION)) {
        return@mono MatchResult.match().await()
    }

    return@mono MatchResult.notMatch().await()
}