Are UDP connections more at risk than TCP ones ?

I always tend to block UDP connections where I let TCP connection establlishing for normal function

in any softwares as U Torrent, MSN etc

Is it justified ?

UDP connections may be needed by legitimate trusted applications and disabling them will impair the operations of these apps.

UDPs are not malicious by themselves and were conceived as an appropriate replacement to TCP for some tasks (UDP vs TCP).

Anyway like TCP even UDP connections could be used for malicious purposes.