I've tried both liquid (citrate) and tablet deprenyl. When I take even 7 drops (equal to 7mg) of liquid deprenyl I feel slight acidic taste, but nothing really strong.
When I take 5mg tablet sublingually i got tongue anesthesia for 5-10 mins. It completly kills my tongue. There is no some specific taste to it, but it's definetly strong.
Now, it's either that liquid is inferior to tablets since you can hardly notice it, or because of different form (selegiline citrate / just selegiline) liquid form doesn't have such anesthetic effect and strong taste.