Don't underestimate any club in the Champions League, even though PSV are more popular. A club like Union Saint-Gilloise can be a seemingly weak club, but they can beat top clubs.
Personally, I think both teams are fairly evenly matched, although Union is given a 4.30 odds. As the away team, they seem trustworthy.
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Overall, PSV can win, but I wouldn't bet on a PSV victory so easily, preferring to bet on the handicap.
The handicap is a wise choice, but there's no harm in taking a high risk on a Union win. I see Union currently possessing sharpness in attack and a fairly good goal production in their local league. This is my plan for the opening round of the UCL. 