I would propose three key questions:
1. Do your really expect your husband to use this board?
2. Do you want him to easily succeed on it?
3. Is your husband less than a world class athlete?
If the answer to all of these questions was yes, then his size and weight will need to be the major component in choosing a board size. You will be able to easily paddle a board his size, it will just be harder to carry around and load on the car. Unfortunately, if you get a board ideal for your size, he is going to struggle and have a challenging and potentially very frustrating time. Unless you are in need of some revenge for his past sins, this may not be a good idea. If he is the type that loves a challenge, and does not mind a lot of falling at first, you could bring the board down a little closer to your size, and let him enjoy the challenge.
I have heard the following size recommendation for a beginning all round board. Take the person's weight in kilos, and double that in liters. In other words, I weigh 75 kilos with an extensive surfing background and I started off happily on a 150 liter board. My wife who is your size wanted a very easy start, and she also started off on a 150 liter board and was delighted with it, other than having to carry it. 200 liters would be easy for your husband, and I would be reluctant to start him on anything less than 175 unless he really loves a challenge. Either of those sizes would be easy for you to paddle, just tougher to carry around.
Talk to some guys at your local shops about where and how you plan to use the board, and they can narrow some ideas down for you.

Nu sup chick. Well actually there is some good news and some bad news. Firstly one of the best beginner boards, the naish odysseus will work for you and your husband as it should carry him if he is close to the 100kg mark. This will also be a biggish board for you and the post above recommend the odysseus are heavy boards to carry around. I am 137 kg and 183cm and find the odysseus hefty to walk 100m to the beach with.
As beginners however you are in good weight categories for buying 2nd hand or pre used and I would recommend this for you as the hard boards, epoxy fiberglass do need to be kept rather well.
I would actually think that for you at your weight a performance isup would be ideal. Its light, your weight wouldnt effect the stiffness and you could throw it around even inflated. Plus you could use it for yoga. If you live more than say 5 minutes walk from the water I cant recommend a wood or fiber glass board. I live 2 minutes drive from a major lake and beach and find putting the boards on roof racks a hassle.
As for your hubby I think he would enjoy getting something a little bigger than your board. Also if he has surfed before his progression is going to be way quicker than yours and then your needs would differ greatly.
All the advice above is also provided by more experienced members than me but I would be looking at the inflatible fly air and an inflatible imagine board for your husband.
Oh one last thing its sooo much better to paddle together. More fun, better for your fitness and enjoyable. Just do a little more research and then test a high quality inflatible from a paddleboarding company and a few demo boards and then decide. A new epoxy or wooden board is going to get dinged, worn, run into rocks, beached, stuck in the shorebreak, stepped on the nose. etc. Learn on a 2nd hand one then go new on your second board after 3 months or so.

I'm with you rock magnet ,I'm 96 kgs and have no problem flat water paddling the 10.6 nalu ..GTW and surfing it,
and it would be a great first board for you nusupchic.i know a few ladies your weight with them
and they have a ball on them .the other ladies who paddle with them have 9.5 Alanas ..and 10' mana's
The 10' mana would be the best suited to your husband ,

Just find a new smaller hubby that lives on the beach front.

problem solved