Which of the two is more effective and not confusing for the subscribes.
Abhishek Thakkar's answer gives good reasoning why you might prefer "Active Plan" or "Current Plan" over "Your Plan" (principally the problems of talking of "Your Plan" in help text). I'll try to provide some other points to consider, although because you give very little context in your question, these are somewhat speculative.
Competitive Market with "Fickle" Users
In the UK at least, the "energy market" (suppliers of gas and electricity) is very competitive, with suppliers constantly vying to get consumers to switch their plans. One particularly common phrase is "Who is your current supplier". If you're in such a market, using "Current Plan" may invoke thoughts of non-permanence; that both the plan and the supplier of that plan can be changed at will. I feel "Active Plan" (or "Your Plan" or "My Plan") carry fewer such connotations.
To a lesser degree, banks and mobile-providers also try to get consumers to switch to their offerings, so the same may apply.
If you're not in such a cut-throat market – you are less afraid of the user switching to an alternative provider but more concerned about the particular plan of yours that they have chosen – then it depends somewhat on the nature of the plans and how easy/often it is for the user to switch between them.
Selecting Between Alternate Price/Benefit Plans
If your product offers graduated plans (e.g. "Basic", "Advanced" and "Premium"), where (generally) each subsequent plan costs more but offers more benefits to the user, then I'd probably favour "Current Plan". Typically, users will select the level that suits them best when they first sign-up and often stay on that plan for an extended period. (Reasons for changing include realising they need more features or starting with a low-cost entry point until they're happy with your service at which point they may upgrade).
In such circumstances, I'd probably favour "Current Plan" over "Active Plan" (see next point for some reasons).
Selecting Between Multiple Plans/Profiles
One of my interpretations of "Active Plan" is in contrast to "Inactive Plan(s)". That is, where a user might have multiple plans or profiles configured at the same time, and they can switch which one is "Active" at any given time. If this is the sort of situation you are in, then "Active Plan" would be the ideal choice.
I realise this last connotation may be peculiar to me (coming from quite a technical background), and may not have the same effect for everyone. Which brings me to my last point:
The Importance of A/B Testing
All the advice you get from here (or elsewhere) can only be general in nature. You have a specific product, with specific users. The only way to truly work out what is best for you and your users is to carry out A/B Testing where you present some users with one label (e.g. "Your Plan") and other users with another (e.g. "Current Plan") and see which "works best" for the greatest number (either through analysis of their on-site behaviour [how and where they click] and/or through a survey/questionnaire of their reactions).
Using "Current Plan" or better yet "Active Plan" gives a clear indication on what is active. It also makes writing FAQs simpler as the voice/tone of writing is always neutral.
A friend used to go nuts writing FAQs when the sentence would phrase like "Open your My Account".
"Click on Your Account" still sounds better, but the tone of the interface is that Ownership of the system is with the developer/company, not with the user. Like Amazon says "Abhishek's Account". To correct this and make user feel at home, early stage UI used to use "My " instead of "Your ..".
"Active/Current" is better.