If stationary lunge = reverse lunge then they're fine, but if stationary lunge means basically a regular split squat without a bench, go with BSS. You could just do walking lunges with DBs and possibly weighted vests if grip is a problem. You can do the others with DBs/weighted vests/both too. Doesn't matter as long as they're unilateral in my opinion, but walking lunges are the best just by a little bit if you ask me.